Blisters in tongue, neck pain, cough,

Over a week or so i am having blisters all over my inner part of tongue suspect inside my glands as well, slight throat pain, cough, husky voice, neck pain on right side. The pain aggrevates in night. I tried taking ampicillin antibiotic for 3 days twice a day along with cobodex z but the blisters have not gone down. It looks like blisters have started increasing. I have tried salt water gargle as well n avoided spicy food. I usually get blisters during winter every year but with cobodex it comes down. Would anyone plz suggest any alternate antibiotic that could help relieve this problem before it aggrevates further. Fyi i have had such severe long episode almost 7 yrs back once n half a decade prior to that. Although this time i dont have severe pain but am concerned over the blister not going away based on my past exp. Appreciate someone suggesting me suitable remedy. Thanks Bala