Re: is it anxiety or something else?
Okay, your symptoms would be more consistent with anxiety disorder and it's not uncommon for such symptoms to appear in the presence of concerns about cancer, particularly post recision of a melanoma. Based upon your dilemma, you may find that an endless search for the right answer from healthcare professionals is the prevailing consequence. In other words, the previous lack of accuracy in recognizing the cancer by several practitioners now has you worried that something else has been overlooked.
I am somewhat dismayed by the practitioners you described that were unable to recognize the very characteristic nature of a melanoma. Unlike some presentations with basal or squamous cell carcinomas, MM is usually unmistakable and rarely overlooked, but it does occur so your persistence was fortutitous.
The nature of melanoma and metastatic disease( spreading elsewhere) has to do with how invasive the melanoma had become and more importantly what the status was of surrounding tissues. Clean excision with no apparent changes to surrounding tissues is a great prognosis, hence the need for early detection. It sounds as though your case clearly falls into this category so no need for further elaboration.
The symptoms of systemic cancer simply do not appear in the constellation you are describing. If you continue to ruminate excessively and are unable to get rest without confirmation, then there is a diagnostic test that can be obtained which would indicate whether cancer may exist. I doubt very much that it's the case, but it's available if you simply must have further proof. Realize, however, that once this test returns negative you must release the matter from further thought in that regard. Some patients can allow unwarranted fear and speculation to consume their lives.
The tests are comprised of simple blood tests, T/TN Antigen, DR-70 and AMAS being the most broad spectrum. These screens are extremely sensitve to cancers and are considered somewhat exotic to common lab capabilities, so they would have to be sent out for analysis in most cases. My impression would be that the tests will all return negative, but if you can't rest without knowing then it's the least expensive alternative to discuss with your physician, who will in all likelihood tell you that the tests are entirely unnecessary. I would agree, excepting the case for peace of mind. Under such circumstances, this would be considered elective in nature and not covered under practice guidelines for such measures. You may find them difficult to obtain.
__________________
Best regards and Good Health