Stop vomiting & back pain = [?

a few days ago i found out i got a yeast infection from the medicine i was taking to clear up my belly on ring infection i was taking amoxxicillan so i took it for a few days but got a yeast infection so i stopped my mom told me to buy monistat 7 and i took it for 2 days. while all this was going on my mom was very sick throwing up violently and bad diarrhea which she thought was food poisoning. on the 2nd night of taking monistat i started to get chills, nausea and i started violently throwing up as well i figured it was the side effects i threw up twice last night and tossed and turned all night my back is killing me to the point where i can not lay down but when i stand or sit up i feel light headed and dizzy i took pepto bismal for the nausea and advil for the back pains but its no help its been 3 days my moms still sick and now today my dad started throwing up! so, i just think i got what my mom got an so did my dad but how do i stop this feeling how do i make it go away? i hate feeling nauseous and my back is killing me i also have the chills i cant figure out weather i want a blanket or no blanket