Tamoxifen and aches n pains

Dear ladies
have u ever felt any aches (Achilles pain) while taking tamoxifen?
im not sure if it's related to tamoxifen ... one podiatrist said yes, other no... 
Im a runner... N i kept running while I was having chemo n after my double mastectomy (after 2 months of recovery) n it helps me to keep my mind in peace...
its quite annoying to stop, coz it's my way to relax and keep my weight.
any suggestions? I take tamoxifen around 5-6pm ... is it too late? 
Love
xx