Sorry but I am about to rant all over your thread.
I have late diagnosed so circulation completely and irriversably fucked high blood pressure and although am on max dose of two different tablets, they don't work very well. GP just raised an eyebrow and said fuck all when told this, so on I go following disinterested doctor's orders. He does prescribe my lactulose though, albeit it 14 days worth for every 56 days worth of tablets. Is nice cos I'm stuck paying for a pre payment prescription card but still have to buy three quarters of the lactulose, all my own painkillers which have skyrocketed in price since the cunty government instituted their dumb mother fucker "only 32 painkillers per customer rule" and I think I am single handedly funding the pharmaceutical company that markets Anusol.
The pills, the high BP itself, certain times in my monthly cycle, the fact that I struggle to eat anything let alone the right thing (even though I can't work out what the right thing is because healthy foods seem to be the worst for my gut) or the combination of two or more of the aforementioned cause hellish constipation, along with a not inconsiderable amount of performance anxiety.
So, I get up, having barely slept because of the numbness/tingling/pain in my feet which is sheer agony. Think that freaky feeling of the circulation returning you get when your foot fell asleep without you noticing, you know, the one that makes you want to smash your head off the nearest brick wall till it passes. I got that pretty much permanently with restless leg syndrome thrown in for good measure.
Take lactulose and spend fuck knows how many hours trying to take a god damn shit.
7 mother fucking hours of drinking loads of water, sitting, standing, bending and bastard jigging about this morning and still nearly blacked out straining in the end.
I am VERY pissed off and utterly exhausted, was shaking and feeling dizzy by the time I washed my hands.
Shitting or not has a massive impact on my day, weird as that may be.
If I go easy, which does thankfully sometimes happen, I am golden. I have to still be careful not to overdo things but am cheerful, grateful and can do some work and get cooking/cleaning/DIY done.
If I have a day like today, I feel terrible. No energy, have to sleep, full of groin pain and struggle to concentrate on any work and household stuff.
I can only work for myself like this, no sane bugger would hire me.
What I find strange is how high BP and low BP can share some of the same crappy symptoms. I also often feel as you describe with the lack of energy, dizzy spells and often getting mentally drained.
It sucks. It's easy to say, "you just have to cope with it all". It's no so easy to live it though.