Question about brain(?) function

I know this is probably a weird question, but have any of you, at one point, had issues with paying attention and feeling drained?

I never really got to thinking about it but seems that other people on my fiancee's side of the family has started noticing it too.
Basically I can't seem to pay attention to things for long periods and that I also can't sit still. This was never a problem before my surgery.
I also have flash backs which can be very vivid and, on some occasions, I will actually hear voices. Sometimes the flash backs will cause me to have an anxiety attack or throw me into a depression mood for a couple of days or even a week.

Needless to say, it has started to concern me plus my fiancee. And I'm not quite sure were to go from this point. My mom told me to see a neurologist, but I'm not sure if that is the best first step. Wouldn't a psychiatric doctor be better?
I know some people with temp ileos need to have their blood checked for correct levels; maybe my blood levels are out of wack?

If I am really tired and the CD is flaring I can have a really hard job concentrating and when I was off recently even doing basic arithmatic was a problem. It doesn't help that I am slightly dyslexic, more with words than numbers and it shows up more when I am tired as struggle to get the right words, even basic everyday words. So I tend to then use words like 'thingeys' and 'doofahs' to describe what I am talking about.

I did have nightmares, not flashbacks, after one surgery in 1999. I had an epidural which didn't work and they didn't believe me and so had no pain relief for 6 days after having a panprocolorectomy. I just kept having nightmares that I was being abducted my aliens and they were experimenting on me and these nightmares went on for about 6 months afterwards. Think it was my brain's way of dealing with the pain and also the opiate in the epidural scrambles the brain thought process a bit when on it.

I would get blood checked and make sure all normal first and that's ok the talk to GP and see if they rec ref to psychiatrist.