Aldo agree with staying with pet plan until you know what the problem is as a new policy wont cover existing problems. And in future get the best cover you can afford and inc life time.
Our puppy rupert is 8 months and has been in and out the vets the whole time we have had him! the insurance has been a lifesaver. We are with AXA for just under £30 a month (in london so more than other parts of the country). they have been really good at paying out promptly.
Just search for "rupert" and "vet" on this site and you'll see how much we've needed good insurance

i hope he gets better soon

lots of hugs from
ellie and rupert
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