Context
Some Experience with running (13:30 2-mile, 5:48 mile, sub-35 5-mile, 10 miles at 8:00 pace with no shin pain). Shoes are under 200 miles, bought in July(Asics Novablast 5). Shin pain has been recurring since early August and keeps getting worse under certain loads. I do have flat feet with essentially no arch. I need help figuring out what this is.
Timeline:
Aug 8: first solo run, noticeable tightness, no stop
Aug 18: 3.33 mi ruck. Pain at about 0.7 mi going downhill, had to fall out for 4-5 min. Pain persisted afterward.
Aug 21: 4 mi run (no notes)
Aug 22: 4 mi ruck, shin issues at 1-1.5 mi, kept going
Aug 24: track intervals, no pain
Aug 25: 2.12 mi treadmill, tightness. Same day a 4.35 mi assault pack run: pain began around mile 1, peaked around 1.5 with throbbing and swelling, eased after mile 2 but stayed present
Aug 30: 8x400m, tightness but ran through it
Sep 1: 3 mi run, tightness after a downhill at 0.6 mi
Sep 2: 5.24 mi zone 2 run, tightness but completed
Sep 4: 8x400m, tightness. Cooldown mile was painful even at a very slow pace.
Sep 5: 4 mi ruck (no notes)
Sep 7: 4 mi easy run, stopped at 1.06 mi from tightness and sat down. Poor sleep the night before.
Sep 8: ruck, stopped at 0.74 mi, pain peaked and I couldn’t continue
Sep 23: ruck, very severe pain in the first mile after a downhill, calmed after mile 2, finished fine
Oct 12: first run back, 1.25 mi on the track (planned 2), stopped due to tightness. An hour later the pain is gone but they still feel tight.
* Worst with downhill sections, rucks, and speed work. Long flat runs sometimes cause no pain. Pain once appeared at a very slow cooldown pace. Swelling and throbbing once (Aug 25).
About 5 weeks off running (Sep 7 to Oct 12), calf raises, tib raises, muscle scraping. Saw a trainer at school after the Sep 8 ruck, who gave me nothing useful. Watched as many videos as I could to find a solution. Losing a lot of confidence in my running ability despite my efforts.