speedometer not working,various warnings, stalls on idol

What is your question?

FirsT check gas cap warning came on, noticed the speedometer wasn't working and the vsc and check engine light as driving, coming off interstate stalled when i stopped pressing on gas pedal, after a minute or so it restarted, drove home but had to keep foot slightly on gas while idol at stop lights? I looked up the vin and according to toyota site no open recall? I'm assuming the recall work was already done (purchased recently) I'm in a total panic, just spent every penny i had to purchase the vehicle... where do I begin to trouble shoot this... I know about the recall and issues this car has had (after the purchase that is, ughhh) is there something with the speedometer not working that is significant to what this could be? Thank you for any input :)