can someone help me with this lateral heel pain

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I am a 57 year old male. I am underweight. I used to be a runner, but gave that up about 20 years ago after a knee injury. Figured I rather just walk so that is what I did for years - about 4 miles every day. Then about 10 years ago, out of the blue - started to get severe, recurrent, chronic pain around my lateral heel and ankle without any acute injury or change in my routine. Only happens on one foot, never the other. I have tried everything - RICE, NSAIDS, different shoes, stretching, etc...and nothing has helped.

The pain always only ever happens when walking - when I shift my weight from my heel or just standing - to my forefoot. In other words, in the process of taking a step, my initial heel strike is fine but when I get to the second half of that step - towards push-off, I can't bear to finish, and end up instinctively limping to keep my foot straight and avoid the pain. It has been so bad that I think this automatic impulse is now causing even further stresses and pain in a wider area since it is so unnatural. There is no pain and never any pain from any movement or motion of the foot or ankle when not weight-bearing as when sitting or laying down.

The pain is always centered on the outer/lateral side about 1-2cm behind and below the malleolus but not really involving or close to the achilles. And the peroneal tendons are not painful. The pain I have is at least an inch away from them.

What is between the peroneal and achilles tendons on the lateral side of the calcaneus?

I have been trying to find out what is capable of producing pain in this area - but there isn't anything there. If you had a triangle with 1 corner being the lateral malleolus, 1 corner being the bottom of the heel and 1 corner being the achilles tendon - the center of this triangle is about 1 inch from each of those points - and there isn't anything there.....it is basically just skin over the calcaneus bone. But that is where my pain is centered - so I am stumped. I can see the achilles and it doesn't hurt - same with the peroneals. From what I can tell, the only thing there might be the sural nerve.

I have been in bed for 2 months and nothing is getting better.

Any ideas or suggestions? This has completely taken over my life. Thanks.