Mine have always been pretty regular and still are at 48. I've never been pregnant. When I was young, they could be painful, but never too heavy. I did go to the doctor about the pain and got mefanamic acid prescribed. Later, I didn't seem to need them as much.
In my late 30s, I noticed I started feeling really low a few days before my period. This probably coincided with me stopping taking the pill, though I didn't track it that closely - and on the positive side, I think the rest of the month is usually better, and I feel pretty good round ovulation.
Into my 40s, they have got a lot heavier with a few flooding incidents. I think it's probably a similar volume as before, but in fewer days. They can be painful to the point I missed work, and that's when I went to the GP, who was fab, and said, "in this day and age, no woman should have her life dictated by periods, and there's a range of treatments and investigations which can be done. We'll start at this end of the scale and go as far as you need." I have been making do with Tranexamic acid so far, which means I can go around 2 hours without having to change protection, rather than less than an hour. (It turns out menstrual cups can overflow.)
I have not done anything about the moods, because I find checking the calendar and reminding myself to see if I feel the same in a couple of days when my period will have started is usually enough to keep me going, and the world isn'the really so bleak (sometimes struggling with that in recent weeks.)
It has been interesting to me how they have changed over 35 years. When I learnt about periods at school, I had the impression that while they could be different for every woman, once yours had settled down, they'd be the same until menopause, except for interruptions like pregnancy. And it appears that's not the caee at all. Of course, I could be misremembering, and they did tell us, and I just ignored them because at age 9 or so, anything past about 25 is unimaginably ancient. Or they didn't want to scare girls that in your mid 30s or so, it could be that you'll find you're recreating the Texas Chainsaw Massacre every month. I don't know. But I do know that I have been surprised at how the character of my periods have changed over the years, particularly in terms of mood and heaviness. To think I used to marvel at his giant and impossibly big my mother's super plus Tampax seemed when I was a girl, puny, tiny things that they now seem...
Anyway, OP, I think if your mood is bothering you enough to ask about it, then it is worth asking your GP. Be aware they are not all as fab as mine was, and if you get one who still thinks women just have to live with it, find another GP.