I had the exact same experience for the first few months off the drug. In my experience this gradually got better with time with it being much better by the 4-5 month mark, tolerable but not back to normal. I know how disturbing it is not to feel tired after barely sleeping, but it’s better than feeling exhausted from insomnia, my doc said its a sign that your body is still functioning and may not require as much sleep. There are people who get changes in the hours they sleep with age ie sleep 3-4 hours a night and are healthy. Try not to stress over the hours you’re getting things should improve with time.
There is cognitive therapy for insomnia if you think that would be helpful. Try to distract yourself in the hours before bed, only go to bed once you’re feeling vaguely tired, going to bed wired will make the anxiety/frustration worse. Try to sleep and wake up at the same time to get your circadian rhythm in check. Exercise in the mornings at the same time and eat at a regular time, all helps with your circadian rhythm. There are other common strategies you can find with a quick google search (room temperature, minimise blue light). Some sleep meds are mostly innocuous, melatonin has been helpful for me in initiating sleep and doesn’t have nasty sides associated with it like antidepressants. I have also used temazepam very short term which has been helpful at my worst but not a solution by any means.
Sorry if this is all obvious advice i hope it’s helpful.
The most important thing, like anything with PFS, is to be patient and not reactive. Don’t drive yourself crazy thinking your sleep will be like this forever, accept that this is a long process and your body should at least improve over the coming months.
Stay strong bud