The bees and wasps you see early in the year seem to be huge - that's because their often new queens looking for a nesting site. Insecticide early in the year means that a whole nest doesn't get the opportunity to form.
We've had a very mild winter so far - I saw daffodils actually in full bloom last weekend (OK, so it was the south coast and near a 'sub tropical' micro-climate) but even my pot plants at work are confused. My Clivia plant that usually flowers whilst I'm on holiday in May, is in full bloom now in January.
Anniehoo... Beemused, your bee sounds like it was a queen who wandered into your floorspace for some hibernation and has become confused by the relatively mild weather outside. As she's just woken up, her directions are a bit off.
Also, the lower ankle is the primary site for flea bites rather than mosquitos. Do you have a pet or have you been visiting someone with a pet?
Animal fleas don't normally bite humans but inexperienced ones that are newly hatched will take a grab at anything with a pulse that ambles by. The eggs fall off the animal or settle in its bedding, they wait in the cracks of soft furniture or carpets and hatch when they feel vibrations. The larvae (like tiny, transparent maggots with a black dot at one end, about 2-3mm long) can be found under seat cushions, pet blankets, in rugs, wherever the eggs settled. These hatch into the tiny black fleas. They don't get the golden bums until they've had a few good meals or got eggs on board.
Regular vacuuming and flea treatments for pets will keep them under control.