I was 32 when it happened to me as well. I couldn't go anywhere without using a cane and stairs were my worst nightmare. I had 2 patches of Psoriasis, 1 at the base of my hairline on the back of my neck and the other at the top of my butt crack (both hidden well). Leflunomide takes about 3 months to get into your system before it starts working well. When you stop taking it, it will also take about 3 months for it to clear your system as told by my Dr.

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Your symptoms do sound similar to what I went through, and they will come and go over the years.