I never leave the hs without my tums!
Definitely Prilosec. Also, try to not eat an hour before you lay down for bed. I also keep Tums on my nightstand. I've waken up in the process of throwing up on more than one occasion and it's usually on days I didn't take my Prilosec.
Get an over the counter ant acid like nexium or zantac and take it everyday and you will be good.