I've lost about 150 elo


Agree with the don't worry about too much -- not sure "there isn't much practical difference between the ratings" is true though. It's harder for me to differentiate 915 and 1060 now, but when i was at that level i could definitely differentiate a 150-point gap like that.
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But yeah, it happens, and slumps do pass. Stressing out also tends to not help, so I'd definitely say don't overthink it too much, and that will help you also.
I have lost about 150 elo, i have gone for 1060 elo to about 915, i have been hanging mates, blundering peices, etc. What should i do