I reviewed the bloodwork and besides the calcium, the glucose is a bit elevated for a guinea pig "normal".
We don't see a lot of diabetes in gpigs, but I would recommend you collect a urine sample from him also and examine. The easiest way I find to collect is to put them in a cage with a grate and just let them urinate through the grate and then collect the sample. As in other animals, glucose could be elevated from stress etc. so we just want to rule this out. As for the calcium, we can see elevated calcium with cancer in other animals (lymphoma) and gpigs can get this so this is why I would want him to have a CBC done also. However, most gpigs with cancer tend to have enlarged lymph nodes that you can feel so I would assume you would have felt this.
As for vets, the site www.aemv.org
does have some listings for some vets in Ontario. I don't know where they are in relation to you though. Also, if you can take him over the border, I know 2 great avian/exotic vets in the Buffalo area. I have worked with both of them and they are great. I don't know if this would be an option for you or not due to the need for travel documents. I just wanted to give you the option. Their info is:
Dr. Alexandra Adamcak -(she goes by Sandy)
All Creatures Animal Hospital
East Amherst, NY 14021
Dr. Laura Wade
Broadway Veterinary Clinic, PC
Lancaster, NY 14086
Also, can you measure how much water he is drinking in 24 hours? Measure the amount of water you put in his bottle and then measure the amount left after 24 hours. The difference will be the rough amount of water that he took in. Obviously if he is with another gpig or the bottle leaks a bit, it wont work.
So, let me know if you are able to get more results for him or whatever else you need.