Bec,
It's great that Jeff has had started recovery after a relatively short time: everyone's different but it often takes 6 weeks or more to experience any response. Many men take ages to get over the side effects, and in some cases it's years.
Yes, Viagra can help with healing, which is a very good reason in itself to keep taking it every 2nd day.
It can take 30 mins + for Viagra to start to have an effect, but regardless of that, I'd keep taking it without any immediate expectations in the knowledge that it will assist the recovery process.
John