If you want to experiment with some antivirals for enteroviruses, this comprehensive list of coxsackievirus B and echovirus antiviral drugs and supplements may be of interest. I have experimented with many of these. Don't expect too much, though, because these antivirals do not have a very strong effect on the virus, but they may help a little. My guess is that your constipation may be due to the virus affecting the nerves in your intestines (the nerves which control peristalsis — the wave-like muscle contractions that moves food along the intestines). When I caught my virus, it caused me to lose my sense of smell, probably by a similar process of the virus affecting in my case the olfactory nerves. It took as long as 5 years before I slowly regained my sense of smell. For the muscle twitching, you could try high dose magnesium supplements, say up to 600 mg daily. The great advantage of magnesium is that not only might it help the twitching, but magnesium is also a natural laxative, so may also help the constipation. Thus you may kill two birds with one stone. (If you are taking high dose magnesium, you should also ideally supplement with calcium, because these minerals need to be taken in balanced proportion).