How can I clear up food poisoning/ being made sick by bad food.?

Today I came home from a very eventful weekend too my grandmother's home (which before going further I'll state, we are staying temporarily until we can finish signing closing papers on a house we are buying, and since we are selling our previous house there is stuff everywhere at her house, boxes and bags of stuff however closing is upcoming so will no longer be this way) I go to the fridge where there is a sandwich the I normally but from the Wal-Mart deli The bacon chicken ranch sun like thing you heat in the microwave. My grandmother along with my mother both encourage me to eat it and get it from the fridge. So I grab it, place it in the microwave because last time I got one of these I ended up not eating it and going to bed after work.. upon taking the sandwich out, I take several bites, and .Then I seen it, small specks of blue/white colored mold. I immediately spit what was in my mouth out..and asked where the sandwich came.from. in which they replied " we found it, in a Wal-Mart bag on the table" (now I'm sorta mad because who puts a sandwich they found no clue how long it's been there in the fridge and encourages someone to eat it with NO warning) the rest of the sandwich went into the trash however after that I have been feeling extreme nausea, I keep taking pepto.. but it wears off every four hours and I'm back to feeling I'll. Is there anyway to fix this?I have a tooth extraction tommrrow as well as work after.