enlarged prostate - not sure - Enlarged prostate

I'm 34, male, healthy BMI, and no known conditions, i.e.non diabetic although my father has diabetes type 2 (diagnosed in mid 50s).. I am taking mirtazipine for the last 2 months and have had anxiety/depression on and off for many years. 

The last month or so I've woken up in the early morning (range from 230am - 6am) and had this strange but slight sensation that I need to pee. I awake to find I have it and sometimes I go pee, other times I have not. At times I've been able to fall asleep after peeing so I have the required sleep.  It definitely isn't a strong, intense, desperate urge but rather just a slight awareness if that makes sense. That's why when I do urinate, most of the time not a great deal comes out - around 8-10 ounces which is actually the normal urine produced by the kidneys overnight.  I always make sure I empty my bladder before bed so this urine can only be the urine produced by the kidneys overnight.  I do tend to have tea before bed which I'm trying to cut down on but again I've always had this and never had an issue. 

Flow of urine is normal, no pain, burning etc. AND I've never been more than once. I know nocturia is usually diagnosed for people who go at least twice in the night.  I realise once in the night for a mid 30s man may be normal but when I've never had to wake up before in my life it's a bit frustrating. 

During the day I have no real telling symptoms although on a few occasions I have got the sudden urge to urinate even though I emptied my bladder just prior and no liquid intake AND occasionally I have a slight strain to get rid of all the urine after emptying even though only a few drops come out but that's not necessary.  I'm fine, my usual self at all other times and can go about my normal day.  Possibly a slightly dry mouth the moment I wake but that soon disappears.

I had two urinalysis done both of which came back normal. Doctor also mentioned it could be just anxiety and to monitor my symptoms. I guess worrying about this makes it worse, I know. 

Do you think this is a prostate issue, like enlarged prostate?  I've never had any problems with sleep and never had to wake up to pee before in my life so this is why it's worrying me.