Starting to Worry

For a long time I made excuses for the amount of hair I've been losing, everything from stress, to the wrong shampoo, to denying it's happening at all. But lately I've been losing startling amounts every time I wash my hair, and I'm starting to notice visible thinning, especially at the front hairline and crown, even though I'm fairly young and a woman.
I've recently been taking supplements I heard should help hair loss, including the most complete multivitamins I could find, L-Lysine, Biotin, Flax and Evening Primrose oils, and most recently (in desperation) Saw Palmetto, but nothing has seemed to help much so far.
Combining the hair loss with the fact I'm tired a lot and my weight hasn't budged in four or five years even if I try to eat less, exercise, and get more calcium and water in my diet, I wonder if I might have a thyroid problem. Unfortunately, I haven't been to have it checked out yet, because I can't get anyone to take me seriously! So far all I've gotten was one person telling me even if it were my thyroid, fixing it wouldn't magically make me drop the weight, and another who thinks it's all a joke.
For the first thing, how do I get people to take me seriously on this and actually get the tests done? And for the second thing, if I do get tested and it is my thyroid, would treating it likely help my problems like hair loss, lethargy, and inability to lose weight, or would it just be another thing I'd hang all my hopes on and be disappointed?

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Edited by Debbie

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Edited by Debbie