Suggest Treatment For Sinusitis And Rash On Stomach

i have a sinusitis and took medrol dosepack first of week but stopped because of side effects. I cant take cillins and mycins. are there any alternatives that may be on the 4.00 price list at local pharmacies or groceries? have rash on stomach to amoxicillin and EES. Live in Woodstock, ga. Today i have taken one time release tab of Mucinix, not D, because i am on BP meds.