I had my medical suspended once for a visual problem. It was quickly re-instated after seeing the Neurologist at Gatwick. During my time in ATC I must have seen a couple of dozen ATCOs lose their Class 1 medical certificates. Most got them back; some lost them for good. Fortunately for the latter, the CAA looked after them with an excellent scheme. Those who got them back had suffered problems ranging from heart (pacemaker fitted), head injury (kicked by a horse!!!), back problems, stress-related problems, etc.
I have a "thing" about medics and every one of my 35+ medicals worried me to death, but I got through all but the penultimate one! My BP was up due to "White coat hypertension" so the doc fixed me with a 24-hr BP monitor, ran it through the computer next day, said there was no problem and signed my chit.
Don't worry - easier said than done I know - but thousands of pilots and controllers go through the same anxiety and the vast majority pass OK.