i had my first fever blister about 8 years ago (i'm 28 now). i usually get them 1-2 times a year (never in the summer). the first one lasted over a month and each one after that has lasted at least 2-3 weeks. i woke up this morning and immediately felt it on my upper lip so i took 2gm of valtrex and started with the abreva and campho-phenique. i have been super stressed out at work and i am assuming that is why it appeared?????anyway, i was feeling okay until about 5:30 this afternoon. it is not unusual for me to feel "sick" when i have a fever blister, but this time it was delayed and it is much worse. i came home and went to sleep for about 2 hours and i still feel weak, feverish, and have a headache. has anyone experienced this and how long do you think it (weak/feverish/etc) will last?