I used to find my periods really really awful. I'd leak every night for the first 2-3 days, using a super plus tampon, two of the biggest disposable I could find placed end to end, and then sleep on a towel. 3am I'd wake up feeling grim and need clean everything. I'd have to double up pads and tampons in the day as well and still change about every 2 hours during heavy days. I'll never forget being stuck in DS1's assembly and realising my time was up and I was leaking.
Anyway the god awful chemical smell and sore-ness from disposables eventually drove me to look elsewhere, and I got a mooncup. I could fill it and leak in a couple of hours. More research and I got a femme cycle menstrual cup instead, it's a very different shape. Got some reusable pads too for added reassurance. I've only leaked once since, when it somehow turned upside down?!?
Highly recommend people try a femme cup if they couldn't wear the moon cup though. They are much softer, thinner and fit to your shape, and have an 'anti-spill' rim that does what it says on the tin.
Honestly life transforming. On my heaviest days I only change it morning, lunch and evening, with a reusable pad as back up. On medium and light days just morning and night with no back up required. Over night is absolutely fine 11pm-7am no leakage.
When I've been waiting for my period to start, I've just relied on the reusable pads too and they are dramatically more absorbent and leak proof compared to disposables. On my heaviest day (without a menstrual cup) I usually only change them every 4 hours or so, and I have never even close to filled one yet. I used to saturate every single millimetre of disposables in half that time, even with a tampon in. No idea if my periods are actually lighter (I don't think so), just they are so absorbent and the blood seems to stay put.
I also work somewhere I am searched every now and then on entry, which has the potential to be embarrassing, but I intend to just warn the searcher before they begin of what they are and which section of my handbag they'll be finding them in!! I assume they wouldn't need to open them etc as I don't think this is done with disposables.. hmm! Might check that!!