This is why you call your pharmacist before taking dosage changes into your own hands.
Why do I feel my bloodstream is full of tiny aracnids crawling up my body?
Bloodstream full of tiny aracnids is totally normal, but if they're making you feel miserable you should probably see an arachnologist.

Hello, Good luck
Here's how to cure your problem: I, too, recommend seeing an expert, but a strong psychologist would be my advice. However, till your appointment date arrives, here are some things to consider.
1. First off, realize that the sensation you describe has been experienced by many people from the dawn of mankind to today. Very few, perhaps none, of our experiences are 100% unique.
2. Most people however, have not seen these symptoms/sensations evolve to the level that is now plaguing you. The fact (if this forum you started is indeed sincere) that the problem is now life-threatening (suicide possibility) demands that you take the problem seriously. A psychologist and/or MD might be able to help you.
3. Now about this problem of yours. When I was about 19 or 20, I met a relative that I considered totally "daft": for instance, she thought that raw eggs tasted horrible and severely lacked nutrition so she only would eat very old eggs say 11-12 days after purchase. She was about thirty-five years old and went to several doctors about many of her problems including with self-diagnosed "excess sweating." She had come into some money with the death of her grandmother. She was very hot, (very attractive, gorgeous is not an overstatement) and liked to go to society affairs in sleeveless gowns. but after about two years her "excess perspiration" symptom reared its ugly head and started to "ruin her life." She not only stopped going to these hoity-toity affairs, but wore fuller dresses and used a bunch of sweat-pads under her armpits. After finding that six or seven doctors couldn't help her, one of them advised her to go to see a psychologist friend of his.
The psychologist promised to cure her IF she would spend one week following his orders 100% in 100% of the detail he ordered.
He ordered her to throw away all her deordorants, anti-perspirants and sweat-pads. He ordered her to buy a simple man's deodorant (no perspiration stoppage) and use it applied LIGHTLY to her armpits. She was to accept the next invitation she got; and to take a simple bath and go to the party in her prettiest sleeveless dress with only one goal: to see if she could outdo her previous sweating and, if possible, drown the entire party in a lake of her sweat. She was to do this for the first hour and then decide whether to go home or stay.
She found it very difficult to sweat at all even in a hot room.
Thankfully, my aunt (she was actually a third cousin) found that not only had the psychologist's prescription cured her original problem, but she stopped being so "uptight" about other inconsequential things (including eggs) and almost overnight became a very normal and warm person thereafter. Even attracting a normal, smart and good man into a very long marriage which is something that had been impossible earlier.
I'm guessing that particular psychologist hearing about your spider problem would prescribe you to try to rile up the spiders in your veins, arteries and capillaries so that they would angrily burst out of your blood vessels. How? If for instance you cough or sneeze or hiccup and then notice the sensation occurring . . . do everything possible to imitate that action and then intensify it. So if you feel one spider, Yeah! See what you can do to create one,two, three or a dozen more. And if you get to feeling twenty of them . . . Hurrah, Hurrah, Hurrah! See about getting a hundred or more of the little devils operating in your blood stream! Every time possible see about creating a new PERSONAL-RECORD for spiders and riling them up by any means possible to get them multiplying and stridently marching around inside or outside your blood. Best of luck.

One would suggest a visit to a medical practioner would be appropriate.
Look his rating, hes probably mentally retarded
according to your rating, you are probably mentally inexistent.
Why are you always trying to flirt with me?
Probably because you're so handsome!
Is a weird sensation. I just want to grab a knife a cut my neck open just to release them! They make my life miserable!