Any advice? i have been having this uncontrollable sneezing and don't know which otc medicine to take?

Depends: If you have nasal allergies, then an antihistamine such as zyrtec (take before bed) or Claritin can be helpful. Benadryl (diphenhydramine) can really make you sleepy if you use it as an fyi. If you also have nasal congestion, nasacort (nasal steroid) is now otc but it works better after using it 2 sprays daily for at least 4 weeks. Nasal saline can also help. Good luck.