So due to illness and meds that have disrupted my hormone levels for years and years, DH and I have barely had sex in many years - there have been a few spells where my sex drive has come back, and it’s so full on and intense, and then usually it goes again. I have no control over it, I have no idea when it’s going to stop and start, it’s very difficult for both of us, and means we both want to make the most of things when we can.
It’s been back a few days and we’ve had a lot of sex. Generally sessions go on for a few hours (not all PIV obviously). My body just can’t take it. Natural lubrication is not an issue when I’m like this but it doesn’t seem as effective as it used to be. We are using lubricant but I seem to react badly to them whatever I try which exacerbates things.
The problem is, when my sex drive first comes back, it’s really full on. The sensible thing to do would be to have a few days off but that’s difficult to do when you’re both desperate for it and you know that any day now it might go away and stay gone (it’s been a year since it last came back). We say that we will just take it easy and go gently, no PIV etc and then before I know it we are getting carried away and things are getting a bit... aggressive 
The other issue is that DH is very well endowed and I am very small, so my vagina takes a proper battering whatever happens. Right now it feels like ive been scrubbed with a scourer - last night I couldn’t manage PIV at all, it was just too sore.
Is there anyone else who has this all or nothing issue, and if so how do you stop things from getting too sore after a full on few days?
I know the answer is to have some bloody self control like grown ups, but that’s a bit tricky under the circumstances!