Yes, I am sure it will be the treatment you have had, but its hard not to worry about every ache and pain! Best talk to your Dr next week, just to put your mind at rest.
Have you thought about trying different brands of Tamoxifen? I have luckily had the same brand (Wockhart) each time except for one month I had a different brand and it really affected me. Mood swings, like awful PMS, and that was on a good day!! Lol!! Worth thinking about as you will be on it for a few years?
By the way, your hair looks great! Is that growth since you finished chemo (sorry, I dont know whether you had chemo or not), or is that how your hair is anyway?
Joan x