Right I can go back and do replies now :) I've done a LOT of reading and research on the topic over the last 2 years and in the 6 months since I was diagnosed (it seems to be one of my hyperfocus topics of choice) so if I can spread any info, I will try.
If this is too much to read my one big recommendation is to google Dr. Russell Barkley. He is absolutely amazing and his lectures (on Youtube) changed my life. They are v. long but v. worth it. I stuck them on while ironing and folding clothes and cleaning the kitchen and just listened. (That motivates me to clean too).
Fret I am always doing things like that with the foil etc. Drives DH absolutely potty. I don't think he believes me when I say I'm really not aware I'm doing it. I also have strategies. I mentioned to my therapist today that I have trouble waking up in the mornings and one thing I use to help me is an alarm on my phone which is only deactivated when I scan a particular barcode. I use my toothpaste. So it forces me to get up and walk into the bathroom. Once I'm there I do a wee and brush my teeth and then I'm awake enough not to go back to bed (though I'm still not really awake). He has given me some exercises to do which might help me wake up further so I will report back on those.
Here is the link for adult ADHD diagnosis in the UK: www.simplywellbeing.com/help-for-adhd/adult-adhd-diagnosis-in-the-uk/
Strictly IMO if the ADHD is under control it should make dealing with your other health issues easier and less stressful.
Thefitfatty That is one of the standard questions actually, they also ask if you've ever been addicted to anything. I mentioned that coffee makes me sleepy. But I think that it's different once you're actually seeing a psychiatrist, because GPs often have no training in psychiatry, and also it's different to say "I tried this and it was great, can I get some on prescription?" than to answer a question relating to stimulants in general, during an assessment. But then I've just gone back and maybe I misread the point. 
Alfie Apparently it's actually very common for parents to seek diagnosis after their children are diagnosed. And the latest evidence shows that ADHD is very heritable. Meaning it is actually very likely that you would have it. Have a look at the link I posted.
In my experience with diagnosis (and the German system might be different, but I don't think it's that different) my GP was pretty dismissive. She asked why I would want a label, and said there is no treatment, which isn't true. She suggested that I try sticking to a programme of three meals, good sleep, fresh air and exercise and see if that helped. It did, marginally, but it was excruciatingly hard to stick to and it didn't solve most of the problems I was having.
People having issues with listening - look up Auditory Processing Disorder. It's extremely highly correlated with ADHD (most people with ADHD have at least one other disorder, another common one is Sensory Processing Disorder, and Dyslexia.)
iPost What is that app? It looks good.