I'm no expert on ADHD so do not know if my comments are worth much compared to those who have experience but I really want to say to OP "Go for it!" If you do have ADHD/ADD, then you may get the help you need and at least understand yourself and your childhood more. Having an undiagnosed SEN can cause shame and self worth issues and maybe even cause unkind or harsh treatment from teachers or school peers and the effects of those can be long reaching. I have read that mental health issues tend to be very common with those with ADHD/ADD and I think whatever ypu need help with, it is worth a try.
I myself am working up the guts to get myself maybe assessed for something which is relatively minor compared to ADHD/ADD (dyscalculia and possible dyspraxia symptoms, not severe but enough to affect my confidence significantly as a child and contributed to my CPTSD and BPD) which caused chaos in an already abusive and traumatic childhood and still affects me in a minor way now (handling money, finding my way around unfamiliar places, understanding how to work appliances etc) and in a major way in terms of the rough treatement I incurred at the hands of teachers and my dad who thought I was just lazy or looking for sympathy.
Because I am in treatment for multiple mental health and physical issues and do have support workers, carers etc It isunlikely that I will really get an asessment soon- am already getting much help to manage my daily life including money etc and there probably is nothing much that can be done for me as am not going to be able to work for a long time, most likely. I don't think am high priority because of these very reasons so for me it is not massively life threateningly important BUT at same time I do believe some of my issues with childhood and teen years (not even so much the actual abuse from my dad and others) but a lot of well meaning adults in my life who just expected so much of me and interpeted my inability to do or avoidance of certain tasks, and as a sensitive lass, it did cause me to feel the whole world was against me at times; I do want some closure.....Probably not a good motive to get it, but yeah I do sort of understand why a diagnosis is important to me. I feel like a lot of my behaviours and attitudes as a child were very dysfucntional, socially as well as academically, and yeah the later MH issues were more likely a result of trauma, rather than the reason per se for these original behavioural issues.. I have always sensed that deep inside I was a bit weird compared to other kids eg able to read very well at an early age, precocious with words, language etc, very ,musical and creative (not genius but bright) yet a complete duffer with maths, sequencing information, and socially had very odd habits. Withdrawn, unable to make eye contact, not really clumsy but uncoordinated. had trouble telling time. tying shoelaces, directions, following instructions, shy and awakward but tendancy to hit out at anyone in my personal space, took ages learning to dress myself properly, always seeking sensory input, bored and restless, even though an introvert etc...these htingds could be nothing but I sense they were or are something, if you see what I mean??? Of ocurse if I have an asessment then it may turn out I have nothing like a SEN and just quirky or more manifestations of trauma. I am a bit more comfortable now with the idea that I may just be or have been a bit quirky- I used to have a lot of shame in me, still do to some degree, but am hating myself less for those "quirks." Talking with the therapist I see for CPTSD and BPD recently made me realise how much I hated myself as a child and how my being unable to learn things the same way as others and being screamed at, threatened, put down or laughed at for being unable to tell time or do my sums caused me to despise myself and consider myself a weirdo.
Apologies to anyone who has died of boredom reading this post. Am looking at what I've just written and thinking "wow where did all that come from???"