It is important to find out what is causing your sever sore
throat. It may be cold, flu, allergy,
Strep throat, tonsillitis, etc.
I know you don't have health insurance, but there may be low-cost county clinic you can have access to. If you have bacterial infection, like Strep throat, acyclovir will not treat it.
Please seek professional medical help as soon as possible!
Good luck!
Sore Throat - Medline Plus
http://www.nlm.nih.gov/medlineplus/sorethroat.