Jaw drop time!
The only way you could have gained that mass back at that rate, with relatively low bf accumulation, was by strict dieting.
At first, I didn't understand why, until you mentioned the before accident weight.
You can easily pack on a good 25 additional lbs of muscle to look like an animal.
Did you remember my advice to doc2b about thyroid drug alternatives?
You can take dessicated raw thyroid, and use thyroid support supplements - a combination that repeatedly outperformed synthetic T4 activity.
You also should consider the addition of
selenium and gugglesterones, in low doses, to your supps. They has been to help with T4-->T3 conversion, which is often the rate limiting step for thyroid hormone activity in those who have normal TSH.
You're probably going to need something to augment thyroid function, as you have been suppressing natural production while on the leveroxyl.
I also suggest you consider taking dessicated thymus (same source, Premier Labs out of NZ, has a tightly vetted and controlled herd, which meets MY paranoia checklist for viral control (BSE). 1-2 caps of each per day, first thing in the morning, with other supps before breakfast.
Your thymus probably took a hell of a beating from the long recovery time AND your dysfunctioning thyroid will be under the same brain hormone production controls, meaning if one is running on low throttle, the other may well be too.
Way to go, 'Stallion!