Dizziness and nausea: due to back treatment or a virus?

I put a disk out in my lower spine yesterday morning; immediately went to osteopath who clicked it back in (it's a regular thing) and gave me the usual treatment of lying on electical pads (you can't feel this treatment). The only thing he did that was different was place one of the pads over my stomach as well.
Today I am experiencing increasing dizziness and nausea - most unpleasant and debilitating. I don't have any other symptoms to indicate a virus, haven't had a cold or ear problems for years. My back feels much better. Should I bother my GP or could it be after effects of the treatment. I followed it with an hour with my TENs machine last night, but this has never affected me before. I do get neck problems but not this time.