hello- and...help!!!

I was diagnosed Type 2 around 4 years ago- got the thing pretty much under control within 6 months and rarely see high readings- despite working split shifts with all the diet difficulties that accompany the problem (I have to take packed food too and carry it with me- so I struggle to find things that are safe to eat- and appetising after 6 hours in a bag) All in all, I am comfortable with my diabetes- I would be even more so if I could shed the weight that set me on this path in the first place- but at 52 its really difficult.
My question- and this is really worrying me- is about insect bites and healing in general. I heal a lot slower, I expected that- and I am a lot more careful about cleaning wounds and using antiseptics, but insect bites is a new development. I have suddenly started to react very badly to bites- swelling, redness, HUGE blisters- and this time- a pad of jellylike stuff which fell off after a couple of days leaving a raw wound about the size of a 20p piece. I have a friend who lost a foot through neglecting a small scald- so I am a little paranoid. Is this reaction because of the diabetes, or is it something else? Should I go hassle my GP, or just carry on treating myself?

well thanks to you all! I can report that the evil bite seems to be healing now- and I didnt know that anything over 5mml meant a slowing of the healing process- that explains a lot.
Ok, some more info bout me- I average fasting at 7mml- and then up to bout 10mml after food.
What do I eat? Its pretty varied, really- for the packed meals- I avoid leafy salads, using peppers, cabbage, celery- anything crunchy- with a good sprinkling of pumpkin seeds- I am addicted to the lil green blighters! Lots of bean based salads too. I sometimes grab something from the freezer- when I have time off I generally cook up a batch of something- chili- curry, something tasty. I do use the microwavable rice pouches, though. I also take a piece of fruit, and sometimes a yoghurt. I have a small insulated bag- they really are awesome- and most supermarkets stock them now- so a frozen meal is about ready to 'wave when I am eating.
I take my Metformin at the same time each day- irrespective of shifts- its quite funny- sometimes I am taking my morning dose as I go to bed- and vice versa- taking twice a day lends itself to that pattern though.
O- and I am a great believer in porridge- cooked with water, and served with a lil milk and some fruit.
You would think the weight would be falling off with such a healthy diet, huh? Sadly- I am not such a paragon- I need to exercise more- I generally come home from work then fall into bed, whatever the time of day- my sleep comes in the form of several naps, generally- so I rarely have time to do any formal exercising- I need more self discipline!