Seen as you've been told what the actual problem is it makes it a bit easier to give advice... given the area of your symptoms etc it wouldnt surprise me if your piriformis had tightened up and this could be a potential source of your pain radiating down the leg as the sciatic nerve runs through it. Rather than me trying to explain a stretch, google a stretch for the piriformis and you'll get nice pictures etc. Its definitely worth a try while you wait. If you're physio reckons theres inflammation then i'd keep icing it after exercise, but im assuming you've already discussed modifying your training in the mean time to allow the inflammation time to settle down... sometimes you have to take one step back to take 2 forward.