Hi Martin, and welcome to the forum, the club no one would ever wants to join but we’re glad you’ve found us now; if only to put your mind at rest so your brain can get on with healing unhindered by worry and anxiety 
My stroke was ischaemic, but there are quite a few members on here who had Homonymous Hemianopia strokes who will no doubt be along over the next few days to help advise you.
In the mean times, as @ckandaswamy says, the fear of another stroke is normal. It was the greatest fear for all the stroke survivors on this forum…and we are all still here to tell our tale…many years on. I myself am 3yrs post stroke and I no more worry about another stroke than I do getting cancer or being run over by a bus when I cross the road. That concern is back where it belongs buried deep in the bowels of my brain where everything goes that I simply have no control over.
You are only a few days out of hospital, stroke recovery is a marathon not a race. So you are not going to be back to normal in say 6 weeks, we are talking 6mths to a year++ depending on the extend of damage basically. The pains in your head are normal, just reading the replies you are going to get here are going to cause your head to hurt. It may feel like:
a headache
a burning sensation
a lead weight on top of your head
a squeezing pressure
a sharp stab or other times it can be a tingling
I’ve experienced all the above and still experience some, the first 3 mainly and on a daily basis, and depending on how heavy my day has been, but they’re nothing I can’t live and sleep with.
Night time is when you are going to worry the most, when your lying quietly and most attuned to your body without any outside distractions. I had a broken ankle several years ago and night time was the worst time for experiencing similar pains and sensations there too, and thought nothing of them, it was just part of the healing process. It just seems more acutely alarming when its in the brain, but the brain has been attacked, its injured and needs to heal too. It can’t do that without some degree of discomfort or pain in the process; and if it becomes too painful then just take some painkillers for it.
Some of us on the forum put this post together to help new stroke survivors with what they can experiences over the coming months. Just click any arrows below titles to expand text.