Hi, I Have Recently Had Surgery For A Removal Of

hi, I have recently had surgery for a removal of a 10cm tumour from my pituitary gland. Previous to this I had a subarachnoid bleed following 2 aneurysms leaking.
although I still have a way to go and that I have been told that this was successful I am struggling to cope with the after effects of this surgery.
I am due for an MRI scan tomorrow and I am also on a lot of medication.
Is it the result of the operation as to why I am feeling so low or is this the medication. I have spoke to my brain injury nurse but feel that I am not getting any answers yet can you shed any light on this for me? I know I have a long way to go yet as the surgery was only performed on 3 June. I am feeling weep, tired, and generally frustrated as I am awaiting the answers.