I got bitten by an insect but unsure of what it is?

When I got the bite my leg (where I was bitten) tensed up immediately and it was very painful. There was a white bump with a red dot in the middle (bee sting??) but now (few hours later) it's gone. I got bitten when I was sitting in the car and it was under my leg. I had my dog on my lap but it didn't... show more When I got the bite my leg (where I was bitten) tensed up immediately and it was very painful.
There was a white bump with a red dot in the middle (bee sting??) but now (few hours later) it's gone. I got bitten when I was sitting in the car and it was under my leg.
I had my dog on my lap but it didn't look like a flea bite.
After the bite I felt quite nauseous and I feel little clusters of bumps over my leg (they're quite small and far away from the bite) but I'm not sure if it was caused by the bite.

If you know anything please reply >.<
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