Hey Mick, I'd be patient with that and definitely not force anything. I wasn't very flexible at that time, I've been doing martial arts for a long time, so flexibility was something I really wanted.
The point now is to let things heal, flexibility will come, but remember that flexibility really requires that your muscles recover properly and carefully. When I taught martial arts, one of the main thing for newcomers is to acquire the flexibility to do the techniques. Beginners would always be frustrated (and some would quit) because improvement in flexibility would come at such a glacial pace (to them). I always told them to plan on a good six months before they were flexible enough to do the most basic of moves without their tighter muscles fighting them.
That seemed to be a good rule of thumb for real flexibility for someone who is basically healthy and is just trying to improve. In our case, no matter what condition you were in before, the muscles have been cut / expanded / thoroughly insulted. For a great cause and I am a great fan, but really were abused. I placed the same constraints on myself as I did on any beginner in martial arts, since I thought that at the least that would be the time to get me to be reasonably loose.
One experience that I had may be closer (although less serious) to the point: I was doing a kick in a workout ant thoroughly pulled my hamstring muscle (I think I tore it partially). It took me a good 4 1/2 months to get back to normal walking, running, etc. and probably about 5-6 months before I could take part in full martial arts workouts.