It's almost certainly stress fractures, the 'irradiation' xray will hopefully show exactly where and also how far along in healing they are.
My own running history is not so long - I started in about 2008; I used to walk a lot but got bored so decided to start running instead. Did my 1st 10k (about 64 mins) Jan 2009,knowing absolutely zero about running. Injured myself(!), had knee surgery which took around 18 months to recover from. Started again but re-educated myself a bit more on the science. Had the good fortune to run with some knowledgeable clubmates and the ultra coach from 2 Oceans. Started doing 5/10/half marathons, really enjoyed the distance stuff, built up too quickly to marathon distance but managed to scrape through Dubai marathon last year followed by 2 Oceans. Moved to UK and carried on with similar mileage with the intention of 2O again this weekend (huh) but the conversion to hard surfaces in UK seems to have been the cause of my stress fractures. I needed to drop the distance and build up again but got carried away .
I learned a lot by paying attention to what the good runners did and I've read a lot. You are my experiment . Mostly common sense, supported by lots of reading plus some personal experience.
You've been doing over 40k a week for the last month actually . Nice strong foundation for progressing off. Good news about the test results so far.
I did my 2nd 20 mins low resistance cycling today, feels ok, I am a bit hyper-conscious of the injury site so every little pang worries me. I have the two sets of x-rays scheduled for next week so hoping to be on a trial job in a couple of weeks.
Yes sometimes the watches go a bit batty, don't worry about it unless it keeps happening. It's a nuisance when it happens before / during an actual event though.
I think palpitations are quite common, could be the heart responding to training - it is a muscle after all. I get them quite often, but more at the moment actually then when I was doing lots of cardio work. Nothing wrong with getting checked out, but your own common sense is important. Some doctors are a bit overly paranoid and think anything other than a gently stroll is fundamentally dangerous .
Good to hear that you really pushed it, that was the point of this particular session .
Update on this / next weeks plan. Since you are doing the LSR on Monday and will be nicely rested you can do 20k on Monday...then nothing Tuesday. I'll put up next week's schedule based on that assumption.