Think I may have psoriatic arthritis, but gp no help

Hi all, im new to here and hope for some help or advice.

I am 29 and had my first baby a year ago. Ive got an underactive thyroid which has been relatively stable until a few months after birth. It became extremely low and took gp a long time to realise that was the problem and increase my medication. At this time, among other symptoms I was in a lot of pain, my body and joints ached and I felt awful. I would have shooting pains in my knees and fingers. 

My thyroid rectified itself after months of increased levothyroxine, however the pains would come and go. Through out this time I had elevated infection level in my bloods and last month my white blood cells were low.

Whats drew my attention to psoriatic arthritis is my flucuating knee and back pain. Sometimes at night my knee can feel warm and sore and at times shooting pains. I would sometimes feel my knee lock almost, be painful to bear weight on and nearly have to limp however with movement this improves. My back is always stiff sore, have been referred to physio now for this. Ive had really bad ongoing psoriasis on my scalp for maybe around 6-7yrs. No shampoos have ever helped and the itch flakiness and discomfort is really getting me down. Im tired constantly but im just told by my doc this is cause im a new mum who works full time. I dont think she takes my pains seriously and if I now mention the problems with my knee she'll just think im a hypochondriac again.

Does this sound likely to be psoriatic arthritis? How can I approach this with my gp? Thanks in advance

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