The two most prominent symptoms for me are the exhaustion and this kind of pressure around my head.
It doesn't hurt so its difficult to compare to a headache, it's more like something is trying to crush my head from all sides.
And I want to say exhaustion rather than tiredness, even though it's similar, but it doesn't feel like I need sleep, rather it feels like after a long day of work, except it's completely free, no work required :)
It's like my entire body is screaming that it wants to rest.
Sort of related to being exhausted, I feel like I have no energy, or rather every thing I do takes like 5x the effort, even something like going to the bathroom to brush my teeth is seriously exhausting to me.
Not physically, but it's like it.. well like you've already had a long day and then still need to keep going, even if it wasn't a marathon run so your physical shape is still good, it still feels exhausting cause you're generally exhausted.
I don't feel tired given I get enough sleep, but that doesn't affect me being exhausted.
I do tend to have more energy for a few hours after getting up though.
And I also need more sleep, if I get about 10h a day I'm not tired, but it might take me another hour to get out of bed in the morning cause I feel very dizzy and like I don't have the strength to get up in the morning.
I can if I need to get up f.e. if I need to use the bathroom., but when I don't need to, even when I really want to get up cause I'm hungry f.e, then it takes a while.
Generally it's not unusual for me to spend 11-12h in bed each day.
Any activity, no matter how much I like it normally sort of becomes a drag after a while.
I can only play games for an hour or two depending on the game before I start to feel very exhausted.
I can read for a few hours before it becomes difficult to follow the words and make sense of things.
Occasionally it feels like I just can't stay up anymore and things sort of intensify for a few minutes.
I can't really see / think the things in front of me anymore, anything I've just been thinking about or been doing disappears and it actually feels like my mind is getting crushed from every side.
And it's difficult to breathe too, as it feels like all the air is getting pushed out of my lungs too. I generally just cramp up and shake, not being able to think anything clearly.
It's not that bad though as sometimes some other things appear on my mind, things that are related to the causes of those things, things that I otherwise can't recall clearly or that normally just drown among other memories so I'd never be able to find them and recognise them.
So it helps clearing things up.