P0463 Saturn -

Question

I have 20 codes on a 2005 Saturn Relay. I have had many problems with this car. Improper fuel gage, door locks, fuze to rear door blowing, hesitant running, computer cut off fuel to motor, replaces fuel cap and fuel pump twice. Stop running completely some times. codes I have
p0462, p0463,p0641,p0107,p0108,p0405,p0452,p0462,,p0463,p0641,p1106.p1107,p0405. surely all these can not go bad at one time. I have had in dealer twice. why when fuse to rear door blow have to do with all these other things. Had complete reset of all codes, key bobs, all codes cleared twice and still having problems. Scared to drive more than 10 miles from home or get stranded. Do I run it off the nearest cliff. only 78000 miles. Witch code do I go by. If I replace all of them cost more than van is worth. At wits end. Some times check engine lite goes off but fuel not right. Sometime if is right with light on. ???Do I start with ground up and rebuild like factory does. Its a lemmon. Please reply if you can. Any info greatly needed.