Definitely go to A&E. ASAP,* *first thing in the morning if you’re sleeping now. It’s quieter then too.
So sorry you’re going through this, it sounds utterly debilitating and miserable.
Report all your symptoms, especially your elevated temperature, the severe diarrhoea you are experiencing, how frequent are these episodes, any dizziness, weakness, feeling faint, disorientation, nausea, malaise, areas of pain, etc etc.
Jot down your medication and dosages.
Make a list of all of your symptoms as it’s hard to remember everything when you’re feeling so unwell. Do not downplay anything! Emphasise! It’s all important for an accurate diagnosis.
Don’t listen to anyone trivialising mosquito bites. It’s completely irresponsible. Mosquitoes can transmit a whole bunch of viruses, and pathogenic bacteria from elsewhere (e.g., from scratching), can all too easily enter the tiniest of injury sites. Untreated, this can very quickly lead to sepsis.
Your reported symptoms are very concerning. The red lines coming from the wound site could be serious too, or they could be less serious - they could be lymphatic inflammation, they could be for other reasons, but esp. because of your other symptoms, and your UC meds, you must be checked by a doctor. Don’t be fobbed off.
As you say, your immune system is suppressed, so unable to mount necessary defence. You are at much higher risk for infection.
Any hives or swollen lymph nodes?
Completely understand about not wanting to go on antibiotics what with colonoscopy coming up & having waited so long :-((. Ask if they can possibly swap your appointment with someone else’s, in perhaps two/three weeks?
My DH is a consultant gastroenterologist & I have relatives & close friends with UC & other digestive conditions. I have an idea of how difficult it makes life. You have my most sincere sympathies and very best wishes for good care, treatment, rest and a swift recovery.