This is Dr. David
these ulcers in the mouth could be due to aphthous ulcers in the mouth which can come out if your immune system is down, like if you are not getting enough rest and sleep and not getting proper nutrition.
some mouth ulcers can be caused by viral infection like herpes type 1 virus which can cause cold sores on the tongue or lip or mouth.
it sounds like you have started antiviral medication with acyclovir
and antibiotic as well.
you will want to avoid alcohol for now and get more rest and sleep.
have you been getting enough sleep recently?