I have a few minutes here to provide some info.
First, off, 43 is a perfect age to enter the perimenopausal phase of life. Peri, is the 10 year period leading up to menopause . In this phase, periods can change length, strength, and consistency. You may notice temperature deregulation, emotional issues, sleep problems, just to name a few. Sometimes period cycles will levle out and feel normal, other times they can be a real surprise. In many ways, this is similiar to when you were just entering puberty. Things were finding their way, and not very well coordinated. But it's quite a shock to women in their 40s to have these issues, mainly because your've done 2 decades where everything was pretty status quo.
Now blood work (labs) in this phase are often pretty worthless. And unfortunately, often totally worthless, as they don't seem to reflect how the women is feeling. Bet you 10 to 1 your labs will come back within normal ranges. The things that they may look at are your thyroid stimulating hormone (TSH) just to make sure your symptoms aren't a thyroid issue. But if they are looking .for peri symptoms, they would test your E2 (Estradiol) level and your Follicule Stimulating hormone. (FSH) As a woman ages and gets closer to menopause, her FSH will rise. It's a feedback loop hormone from the pituitary gland in your brain that encourages your ovaries to produce estrogen.
I'm 60 and been in menopause for several years now. But back in peri, I did try both the BCP and bioidenticals. Nothing worked, and it often made me feel worse. Having said that, many women do like the pill during this phase, if you can find one that suits your system.
Not to worry, we've all been down this road. The best thing I can offer is to be really good to yourself. Eat a really good diet, take a good multivitamin, drink plenty of water, get to bed by 10pm, do anything you can to de stress and take some time for yourself. A little exercise, but don't over do it. (We use up our chemicals as we exert ourselves.) Give your body the best chance for coping and changing. It will likely be another 10 years of intermittent odd sensations and strange cycles before you finally quit having periods. The average age is 52 1/2 for menopause. But no doubt things are starting to change, and you're feeling it throughout your entire body.
Come back with questions, and get some good books to understand what's happening.
Hope this explanation helped.