I'll weigh in here with my own (jaded, biased) experiences...
Firstly, I know nothing about the ATC route, but that obviously requires a specialised training path, I did a quick search and found this-
I note that one of the entry requirements is a medical... so, not sure what the nature of your seizure was, but this could affect your ATC prospects.
Now for your engineering questions;
I can only speak for UK - I went to Kingston, which was great, but it is still a 'young' university and probably doesn't hold as much prestige as some others. I've heard good things about Brunel, Bristol and Bath uni's.
As for Embry Riddle... I personally haven't been blown away by the Riddle grads I've met, the one thing I think they all seem to have in common is debt. Lots and lots of debt. I believe it's much more expensive to get a degree in the US, and especially at Riddle, from what I've gathered the cost of an entire year's tuition at a UK university won't get you through one semester at a typical university in the US. I believe Kansas University, Kansas State and Iowa state are pretty good for aviation though. Certainly the big midwestern airframers seem to recruit heavily from those schools.
Btw, are you near Delft? - http://ocw.tudelft.nl/bachelor/aerospace-engineering/
As for job opportunities, personally I believe the respective University systems in the UK/Europe Vs the US have a huge affect on job prospects. As aforementioned, because it is so expensive to go to the school in the US, I believe there is a relatively low throughput of engineering graduates to fill the large number of engineering jobs produced by the huge industrial base in the US, as a result, in the US if you have a degree, a social security number and a pulse, you can easily find an entry level engineering job - this was especially true pre-2008. If you are also a US citizen with security clearance, you probably don't even need a pulse.
As for the UK, the Universities are churning out so many graduates, that competition for the relatively few number of entry-level job openings is more intense, and it drives the salaries down. Only the best(or in my case, the lucky) get the aerospace jobs, the others end up in non-aero fields or quit engineering altogether. Not sure if the same is true on the continent, but I believe France and Germany are like this too.
I think the answer for this will always be; scholarships, bursaries, grants and LOANS.
All the foreign students I met at uni were living off of loans and their own earnings - there is in fact quite a problem with getting foreign students to repay their loans after they've graduated and left the country! But I digress...
The UK government increased tuition fees from £3,000 a year to a whopping £9,000 a year, which was met by outrage and disgust by most UK students, meanwhile in the US one year at Embry riddle will set you back $42,294. You basically have to take out a mortgage to graduate there.
I note however that Universities in Iceland charge no tuition, is there no aerospace degree you could take on home soil?
Anyhow, take my comments with a pinch of salt, and good luck with your future career whatever you decide to do. (Mechatronics is a GOOD and growing field to study btw, so you're already on the right track)