There's a lot of theory with 1...e5 too. The main difference is that your king won't be under attack so often.
You may also consider switching to a calmer Sicilian (like Acc. Dragon, or O'Kelly, or some 2...e6 Sic.), so that you can capitalize on your knowledge of Anti-Sicilians variations.
I've always played the sicilian against 1.e4. I love it. I think it's so cool. The Najdorf brings the most crazy, razor-sharp positions in all of chess.
However I have a confession to make: I'm a bit tired to study theory, having to memorize moves, and mostly: being extra careful just to stay alive.
I've noticed a really bad thing. Theory is vital for black to survive. Not so much for white, who can just play natural moves and still have chances to blow you off the board.
I played against a friend of my own strength, who knows ZERO theory, and he still gets to attack, attack, and attack. So I have to tread really carefully, calculating accurately at every move, while he just puts all his pieces on the kingside and gets all the fun.
And why do I go through all this trouble anyway? Has anybody EVER managed a successful minority attack with black in the sicilian?
I'm becoming a bit disillusioned with the sicilian. I know GMs use it a lot, but they are 100% prepared. What about amateur tournament players? Is the sicilian so effective between people who don't have professional preparation?
I was considering going to 1...e5. I used to play the Ruy Lopez as white so this one shouldn't be too hard to prepare for me. But I know absolutely nothing about the Italian, the Scotch, the 4 Knights, etc.
But the question is: maybe I can play those openings knowing only a small fraction of the theory that you need to survive in the sicilian?
The rating range I'm interested in is 1800-2000 FIDE.