Tom, bluntly so it cannot be mistaken,get a definite all clear and clear assessment of risks involved.
If you are getting vitreous detachment at a younger than normal age other factors in your health need evaluation!!!!.
I would strongly suggest you forgo the surf until you have the full medical advice and are in a position where if necessary something can be done!
Are you willing to take a 1 in 5000 bet with your eyesight without all the information
I googled this British website with a full lot of informationhttp://www.rnib.org.uk/eyehealth/eyecon ... H2Heading3
It may help, one thing I am aware of is to look to see if the physical activities increase your floaters or even more important increase the flashing lights as the detachment tugs on your retina.
My advice still is to get the check where you can both understand in full communication and of course you have a chance at health care with in your home countries health system.
I've taken up troll hunting just for fun, instead of a rifle I'll just use a pun!