I have a 2002 Buick Rendezvous CLX and the tranny just stopped working while on the highway after getting it serviced 6 days ago?

Have had many probs with this care from computer under the chassis needed
to be replaced and reprogrammed ( only by the dealership) $2300 to over
heat and blown head gaskets at 85,000 miles to all 4 antilock break  sensors  
being replaced ( full wheeler hubs to replace them) to A.C. Probs! I've had the
oil changed every 3 months needed or not the tranny and all systems flushed
or replaced a head of schedule cause they went bad before they were
suppose to! Now with a brand newly rebuilt motor ( $3200) and of course the
tranny serviced 6 days ago, I was going down the highway and the motor
started to over ev like I was passing someone,, only I was only going 45 and
getting slower by the sec, pulled over and now have NO gears including park!
What the heck ( other words not appropriate for this post) is going on?
Anyone ells having this prob? If so please give details as to what it might be
or how much this is going to cost me?  Thx for any help! This is crazy! And
the Luces none slip stuff? Is crap, don't listen to them posting its a damn fix!