The issue here is to determine whether the flank pain
is related to Raynaud's or otherwise. In view of elevated platelet counts, there is a reason to keep in mind a possibility of a haematological disorder which in fact may have resulted in Raynaud's as well as pain in the flank. You need to consult a Haematologist (or a Physician if a Haematologist is not available). Further management can be planned after obtaining Haematologist's opinion.