Whoa caffeine overdose would NOT have been pleasant at all!!!! Shit!
Yeah, I am the same as you man, I always just reach for the meds, for whatever ails me. It really bothers my husband. He thinks I'm just constantly popping pills when in reality these days I hardly take any pills COMPARED TO what I used to! When I was legitimately addicted to pills, I was taking about 30 pills a day, for yeeears. Now I just take my prescribed meds plus the odd nurofen here and there.
Anyway...
There are a couple of over the counter meds that can help with the stomach cramps.
Buscopan - not sure if this is available in your country, but ask at your pharmacist. It's great stuff, perfect for stomach cramps.
Imodium (Loperamide) - this will definitely be available where you are, it's available worldwide. Definitely get some, it's very helpful for opiate withdrawals.
Peppermint tea will also help.