What do I do????

Okay Moms of the world unite:
What do you do with a baby that won't stop screaming & crying?... Here are the things I have tried:

1. Feeding him
2. Changing him
3. Rocking him
4. Walking him
5. Putting him down on a blanket to play
6. Putting him in the excersaucer
7. Putting him in the jumper
8. Putting him in his crib
9. Laying w/ him in my bed
10. Putting him in his carseat
11. Going for a walk
12. Going for a drive
13. PRAYING
14. Feeding him again
15. Rocking him again
16. Calling Juan while he's working and just crying and crying
17. Juan coming home from working to hold him for 10 minutes so that I don't throw him out the window
18. Rubbing his gums
19. Rubbing his belly
20. Giving him gripe water
21. Giving him gas drops
22. Giving him teething tablets
23. Giving him infant Tylenol (generic)
24. Putting in a movie
25. Putting on music
26. Letting him roll around on the floor
27. Putting him on his belly
28. Putting him on his back
29. Reading to him
30. Singing to him
31. Talking to him
32. Crying with him
33. Feeding him again
34. Rocking him again
35. Putting him in the Moby Wrap and walking with him

I am out of ideas and SO SO SO tired and frustrated. I am wondering why God made me a mom. I am so not cut out for this. How can this kid go 6 months as an absolute delight and then suddenly turn into this... :( HELP!

May God bless you today...