I Am A 48 Year Old Male. I Have Been

I am a 48 year old male. I have been suffering with daily groin pain since a football injury when I was 35. I did have an inguinal hernia op when I was 36 (though no lump) but no effect on pain.
I had 5 relatively good years before 2014. Then pain suddenly started again after playing golf and after having sex and the pain continued for several months. Unfortunately, I ended up with a dvt in that leg, then a pulmonary embolism. Was put on anti-coagulants to deal with this in hospital and thankfully the pain went. I am now on anti-coagulants for the rest of my life.
However, unfortunately the groin pain has suddenly reappeared. I have been in constant pain since early April 2016.
The pain varies in scale and also by description. It can be a stabbing /tearing /burning pain in my right groin where the adductor muscles meet the pelvic bone, going all way down to my knee; sometimes a constant ache also in the right testicle; shooting nerve pain and cramping sensation all way down from adductor muscles down through to the calf muscle; right foot changes colour to purple when standing and feels very cold when compared to left foot. Any kind of activity (walking, etc.) induces pain, especially couple days later. The pain always come on strong about 2 days after any kind of activity.
I am at a loss as to what this could be. Doctors and physios have not come up with any diagnosis. Always get the ‘good news we cannot see anything wrong’ message after any MRI scan! Of course, this is not good news as I desperately am seeking a diagnosis so I can proceed with appropriate treatment.
Any advice would be much appreciated.
The doctors advised there’s no new dvt.
Thanks in advance,
Paul