Hi Emma and welcome to our world...
Not a long message, but just one more word to say that it is all cool, and that provided you stick to taking a couple of pills per day, there is not much to worry about. The ONLY issue I potentially see, which has not been touched-on so far here, is that if your boy needs to take other meds, then you absolutely need to check whether they are compatible - but I reckon you know this already...
Adie from that, you risk having significantly more damage to you and your son's lives by living in the UK under that dreadful regime that is known as a government.
Oh - I COULD (in CAPS) go on and on and on abut that ****-show, but will leave you with positive energy and vibes...