@ysmina-- There are lots of home remedies for blisters, but my first recommendation would be to take a vitamin called L-lysine, especially if you get fever blisters often. This is a great vitamin, it strengthens the immune system and reduces blister outbreaks.
Aside from this, you can apply salt or diluted tea tree oil on the blister. These will dry it out and make it scab over faster.
Ice is another great remedy. If you apply ice when you feel the blister coming on, you can prevent it from developing. If it's too late for that, you can still apply ice to numb the area and ease the pain. I hope you feel better soon.