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Not sure what is wrong

759 3
Okay after i got the codes for fuel rail pressure to low, fuel pressure to low, and the code for not enough fuel being delivered to the pump, the truck had no power nor fuel mileage. Then i was told to do the fuel filter, and i did that this morning, and now i am getting the the over fuel pressure relief valve activated, along with the others i have listed. The fuel mileage is now back on the overhead about where it was before, except only some of the power is back. And i tow 25000 pounds every weekend, and with this problem i am only getting about 8.5 miles to the gallon towing if i am lucky, when it was like 14.5

If anyone has a clue what is wrong I would very much appreciate the help.