It's not great, sorry. Honestly, my mum was like this for a time in my early teens. It was largely due to depression brought on by a number of factors. She would come home from work and go straight to bed and stay there all day. It wasn't great. She didn't notice when my clothes wore out and my shoes became broken or when I had various issues that I then had to sort myself. It lead to me getting into difficulty in my teenage years, as nobody had enough time or energy to really check what was going on with me. She was not an involved mother during that time.
I almost fell into the same trap when my eldest was about 7. I was so bone tired that I was convinced I had ME or something similar. I started staying in bed a lot. Then one day I realised that all my daughter was seeing of me was this lump in the duvet, just like I did my mum.
Basically I stopped going to bed, even though I felt so tired that I just wanted to curl up and die. I made myself stay up. I also went to the doctors, tweaked around with antidepressants, and starting taking vast amounts of vitamins and supplements. I pushed myself until I broke some sort of tiredness barrier, and actually I've never felt like that bad again, despite having newborns since.
I suspect there may be an underlying autoimmune issue amongst the women in my family, as both my grandmother, mother and myself have certain conditions which seem to me to be linked to our exhaustion/occasional depressive episodes.
So my suggestion is perhaps rather simplistic, but don't go to bed. You haven't been diagnosed with anything that could be causing more than the usual amount of tiredness, so look to your mind and your diet and see if you can make changes there. You don't "have" to go to bed, but you're likely mentally exhausted. Going to bed doesn't solve anything as it doesn't make you feel better. Go back to your GP, try different tablets, and push through as much as you can.