HELP WITH SPIKE IN BG

Hello all.
My sweet little Christopher has been OTJ for about a year and a half. He does have an occasional spike but his numbers have been in the 70s to the 130s consistintaly. He is diet controled. Hasnt had insulin. OK..... I test about every 2 weeks ( I know I shoud do it more often) 2 days ago he was lethargic and wouldnt come and eat with the other kittys. I tested him right away and he was at 233. I let him sleep and 8 hrs later he ate like a champ and after 3 hours I tested again and he was 133. Today he ate in the a.m... and I just tested him again (2 hours after his afternoon meal) and he was 163. Should I be worried??? Should I keep testing every day and see if he "normalizes"??
OH.... btw.... I have had a house guest on and off for the past 2 weeks. Im sure that this may have added to his stress level since we only have myself and my brother in the house on a regular basis.

Thanks for your input.

Krissy and Chrissy

 

Could he be coming up with some kind of ilness? UTI or flu or something? that could be raising his numbers.

Still I would monitor him and see if his numbers go down but I wouldn't wait too long to start him on insulin again, the sooner you start treatment the better chances you have on getting it under control fast