In reply to Game of Conkers: Sounds like you're doing all the right things. If you can run without pain then I would, firstly it's good to keep as mobile as possible while recovering and secondly it's a good excuse to stretch, before, during and after if you're having trouble with tightness.
Make sure you don't go too hard on the foam roller, it's going to hurt a bit but don't murder yourself on it, especially if you're using the rumble roller. It should be hurting less the more you do it but you don't want to go too far and damage your muscle tissue more or bruise yourself. As with most things, little and often wins the day.
There are a myriad of causes of tight hamstrings; if static stretches, foaming and a good range of strengthening exercises don't give you improvements in a month then a physio is probably going to be the best way to avoid a chronic problem.
Ben