I'm 38 and my periods have been all over the place for the last few months:
2.5 weeks of light bleeding in August
2 weeks after it finally stopped, the heaviest period I have ever had, woke up in the night looking like I had murdered someone in bed, was using heavy duty protection and everything soaked through
Then very light bleeding every four weeks until earlier this month
Then this week, 2 weeks after my last light bleed, extremely painful and heavy period again to the extent I'm having to WFH today as I don't trust myself in the office, although actually I just want to crawl back into bed
This was also accompanied by what I realise with hindsight was the worst PMT I have ever had last week. I was really anxious and unable to focus at work, and I ended up missing an important deadline and crying in front of my supervisor about it. Very unlike me, I'm a fairly senior professional.
Ugh. Writing it all out it is definitely the start of peri, isn't it? Is it worth going to GP? Until I had my children, I always had irregular periods (apart from 14 years on the combined pill) and used to being told it wasn't anything to worry about or nothing they could really do.