Yes, I had similar feeling after about a month or two on estrodiol valerate tablets and spiro. Went to see GP, he said nothing to worry about and it was a pinched nerve in my spine aparantly... poked around my back, and OUCH, hurt like hell by my spine/upper back :-/
Told him im concerned about DVT, but he said its not likely and I should watch out for swelling of calves and obvious pain.
Had ECG to confirm heart condition, results perfect...
Few weeks later my endo also stated DVT unlikely and only to worry if there is swelling or severe pain...
So, I'm not exactly sure what it is, but stressing about it seems to make it worse, and I then start seeing things that are not there. ( to me it seems/feels like reduced blood flow, but then again, certain things I think were like that before HRT... I think...)
Remember, your body goes through some serious changes when on HRT, I bet there are MANY things that change/feel different.
Unfortunately, google is not always your best friend with medical advice. Or let me rather re-phrase that "GOOGLE IS NEVER YOUR BEST FRIEND WITH MEDICAL ADVICE"
Google and minor aliment, and I guarantee that you will find most links with state that you have cancer or some kind of heart issue. ..
I should have been dead before the age of 3 if google was right...
Unfortunately, it is best to see a doctor about medical issues.
But cross gender HRT is still relatively new, and there is not as much thorough research done on it so far ( compared to other medical treatments).