I can't say for addiction to the gateway drug in particular, but I'm sure it's normal. Withdrawal after heavy use of any drug is normal, and unfortunately it's something that you'll have to ride out.

Good nutrition helped enormously for me, so I'd recommend that -- the right vitamins and minerals, and staying away from caffeine, alcohol, and junk food. Fast food has MSG, which made me edgy. I'm not sure what it does, but I had bad reactions. Try to get good sleep, too, and communicate with your docs about how you're doing and what you need.

Congrats on trying and reaching out for help! And good luck!