Tamoxifen is not that bad! You must be pleased with the 3 years 3 months - is that 5 or 10 years all up? Mine is to be for 10 years. Letrozole was for 6 months but the bone pain was unbearable and I have changed to Aromasin, which is steroid based (yuk!) however it is working so that is what I have to focus on! I did do in excess of 2 years on tamoxifen but my side effect was gynae related - no hot flushes et cetera
Wishing you all the best! Hopefully you can manage the arthritis and the odd side effect is all you have to contend with and counting down to your next break
Take care