Lee, first I would recommend that if you have time, go back through our post for the past couple of months..Most of us have shared our frustrations with ROM, sleep, aches, sharp pains, constipation and pretty much life in general.
Don't be worried sick..If your Dr. is satisfied for now, then you must be doing something right.
I pretty much practice ROM most of the day. I am 9 weeks post op. Last week I was at 0 for extension, and 130 for flex.
Couple of ideas for you.
Hot tub. Get in a hot tub and soak the leg in hot water. Put your feet at the end of the tub and slowly slide down in the tub. Hold at that point for a count of 20 and then come back up. Reach forward and stretch the hamstrings. Do this 6-8 times. Each time attempt to get more bend. It works very well. This was my ninth knee operation and I've used this technique for all of them to regain my leg so to speak.
Secondy, If you can get to a gym with quality stationary bikes, do so. Most gyms do have an option of one month membership for therapy issues.
Start with the seat high. Warm up. Every 3-5 mins lower the seat one setting. Go as low as you can. When you get to the uncomfortable point, you may need to start out with peddling backwards. Then go forwards and rock with the motion. It will hurt but after awhile you will loosen up.
One big caution, don't over do it. I have a bad tendency to do that. Ice, ice and ice.
Hopefully this helps. Please let us know. God Bless.
Doug