I pulled a hamstring in August doing sprint training and it just hasn't been right since. Even when walking a can get a dull throb right in the centre of my right buttock. Oddly I have no twinges at all when out on the mountain bike.
Rolling it with a tennis ball and performing stretches eases the pain but it just comes back again when I start walking again. I might have to bite the bullet and book a physio session.
Sounds to me like tendinitus mate.
Have a look at the symptoms and see what you think ?
I developed mild hamstring pain doing hill sprints, as part of training for a marathon in 2020.
I didn`t rest it, as I didn`t want to compromise my training plan and it eventually turned into tendinitus, which I`ve had ever since.
The symptoms you describe there, almost mirror mine.
It doesn`t stop me from running, as it`s just a dull ache more than anything and I`ve learnt to live with it.
The only cure I can see, is to stop running until it`s gone, which I`m never going to do lol