I feel your pain mate... lowering test levels are the devil in a (not great) disguise.
I noticed my levels dropping after my second child was born about 3 years ago - I was 39. Fat started to pile on, particularly around my waist, and muscle seemed so much harder to gain..
I tried all the various 'natural' and herbal test boosters with no noticeable effects.
After seeking a fair bit of advice - including some from people of my age on here - I went to my local doctors. I got a blood test done quite easily, no issues there, but my levels were at the low end of 'acceptable'. And that is 'acceptable' based on a healthy adult male of my age... NOT taking into account a life-long passion to lift ridiculously heavy lumps of circle shaped iron.
Again, after much internet research, I decided I needed a prescription testosterone. Here in the UK, where the health service is free, they dont like to give away much if they can help it!
My first attempt was with a - to be fair, very attractive Asian babe doctor - hence I was more than a little embarrassed, when ramping my situation up, in order to get my testogel, by having to say that I have problems with my virility - especially first thing in the morning - and all that... I'd better just add, incase any extremely hot - and ideally loose and living in London - women folk, are reading this, that I DONT...
Anyway, apparently, very attractive Asian babe doctors, don't care.. and don't appear to know much about men's testosterone levels... so she 'sought advice', didn't get back to me, and ultimately declined to assist my request.
I left it a couple of months. Got more frustrated. And fatter.
I eventually decided to have another go, and got another doctors appointment. This time with an old fat male doctor.
I gave him the same sob story about my fatness, my lack of sex drive, my health and all the rest of it, and probably bored him into submission, and he signed me up for a daily doseage.
So basically, persevere. Keep trying different doctors. Ramp up your ailments. Throw in a bit about longevity and how you want to see your kids (if you have any) grow up.
You need to ask for the testosterone tests, and any prescription testosterone, by going along the health benefits, rather than the leisure aspect we all really want it for.
And you may be better off trying an old fat doctor rather than a sexy young - unsympathetic - hot doctor.
Just my - long winded - opinion.
Best of luck mate. I've been there
Brix