My son has autism and had IQ tests as part of a full psychology analysis to help us work out why he wasn't thriving in school.
One of the first things the Education Psychologist said was that the idea of a single number for IQ is totally discredited by professionals these days so tbh either the person who analysed you is not a professional to be trusted, or you haven't fully understood what you were told.
The analysis we had included 5 different measures of different kinds of intelligence:
Verbal Comprehension Intelligence (VCI)
Visual Spatial Intelligence (VSI)
Fluid Reasoning Intelligence (FRI)
Working Memory Intelligence (WMI)
Processing Speed Intelligence (PSI)
You don't get an absolute "score" like 75 or 120 - you get a "centile" number ie 50th centile would mean that among the general population you are exactly in the middle with 50% of people scoring higher than you and 50% scoring lower than you. 90th centile would mean that 10% of people score higher than you and 90% score lower than you
It is quite usual for people with neurodiversity issues to have big differences of where they sit on these 5 scales. My son is 99.9th centile for some scores and lower than 50th centile for others. He is exceptionally bright in some ways and needs a lot of support in others - this is the nub of understanding neurodiversity.
I am concerned that the person you saw gave you an old-fashioned IQ score and agree that you should seek a second opinion. We had to pay £2000 for the full analysis our son needed and we were able to check out the professional credentials and reputation of the psychologist in advance - was the person who you saw fully professionally qualified?