I'm a coward

What I was told, is that NVLD (=NLD) is a different kind of diagnosis from a neurological perspective whereas ASD is a more behavioural diagnosis. 

NLD often occurs together with ASD (but not necessarily). You might find the thread about the verbal - performance gap interesting thread on verbal vs performance IQ gap . NLD is something that is very clear from IQ tests, spatial insight tests etc... This learning disability is quite common in ASD, if I understand it correctly (I am not a professional !!) it is when when the verbal IQ is much higher than the performance IQ.

These are invisible handicaps which cause great stress in the workplace and in your personal life. For instance: poor visual short term memory, bad spatial insight, etc - because you are verbally strong - people totally overestimate your capabilities and put mistakes and shortcomings down to "laziness and sloppiness and not trying hard enough".  People with this invisible handicap put great efforts into compensating and this then takes its toll in the long run. 

I think caretwo is right: it is up to the professionals to do all the tests. It is not an either/or story and good professionals will give you the results of the tests with pointers where your deficits are - so you can better understand yourself and explain yourself better to others. You don't need a full diagnosis to be able to say for instance: "I have a disability with regard to the visual processing of information". 

What I was told, is that NVLD (=NLD) is a different kind of diagnosis from a neurological perspective whereas ASD is a more behavioural diagnosis. 

NLD often occurs together with ASD (but not necessarily). You might find the thread about the verbal - performance gap interesting thread on verbal vs performance IQ gap . NLD is something that is very clear from IQ tests, spatial insight tests etc... This learning disability is quite common in ASD, if I understand it correctly (I am not a professional !!) it is when when the verbal IQ is much higher than the performance IQ.

These are invisible handicaps which cause great stress in the workplace and in your personal life. For instance: poor visual short term memory, bad spatial insight, etc - because you are verbally strong - people totally overestimate your capabilities and put mistakes and shortcomings down to "laziness and sloppiness and not trying hard enough".  People with this invisible handicap put great efforts into compensating and this then takes its toll in the long run. 

I think caretwo is right: it is up to the professionals to do all the tests. It is not an either/or story and good professionals will give you the results of the tests with pointers where your deficits are - so you can better understand yourself and explain yourself better to others. You don't need a full diagnosis to be able to say for instance: "I have a disability with regard to the visual processing of information". 

I've only done an official test once as a teenager and never knew the result. However going by admittedly questionable online tests I score 137 and 144+ for verbal  and the following for non-verbal/visual spatial   -71,61,73,85,72,72,77,63, 82,72,84,81,75,67,56,

Mensa DK gave me 94 taking a stab at it and 80 just pressing randomly
Mensa DK= 80/94= 0.85 It may or may not give undue weight to random answers. Mensa Romania gave me 80 and under 75 taking a stab/choosing randomly. Mensa Hungary  gave me 73. All are non-verbal.