When can I sleep on the other side grrrr....

Yes it sure is a real challenge.  I've had a lot of trouble too having had a double mastectomy and axillary dissection on one side so could only sleep on my back for about 5 weeks.  I slept in a recliner chair for all that time as I found that much better and more supportive than a bed.  My back was very unhappy at first but it gradually became easier - certainly did not get much sleep during that time.  Then I went back into a bed and after experimenting found I could sleep sort of halfway onto one side while propped up with a pillow each side!  I kept experimenting till I found something that worked.  As for bras I also had a lot of trouble tolerating them at first but it gradually became easier as my soreness improved, must be lucky there as I am only 8 weeks post-surgery now and into Chemo too.  Hang in there!