So, I've had three children and tried everything and not everything works for every baby and you are of course free to think any of this might be a crock of but for what it's worth, food was the key for me (at the end of a long search!! - the other things help relieve symptoms).
Get a sling, reflux babies like being carried around. Get others, your Mum and DH to carry round in the evenings, preferable away from you so you don't have to hear if he is upset.
Get a vibrating chair and or a swing. Don't feel bad about getting a dummy too (if he will use it).
Try seeing a Homeopath, might not fix things but Camomilla and Dioscorea might help.
Try seeing an Osteopath with Paediatric training, sometimes the diaphragm is tense and high and relieving tension in this muscle can relieve the symptoms.
Food: Take dairy, eggs, wheat, sugar, caffeine, nuts and sesame seeds, and deadly nightshade veg (potatoes, tomatoes, aubergine and peppers), citrus, out of your diet and see if things improve. (Rice, chicken, white fish, sweet potatoes, camomile / fennel tea. I've asked on another forum for a link for the other things to eat (it's a pretty short list!). Start with this and if you get an improvement, you can start introducing foods to find the culprit or find a Kinesiologist to help to avoid having to make your DS uncomfortable during the process of elimination.
Night times: If poss, get your Mum to have your baby for a couple of hours in the evening. Unless your DH is away (I've not read your other thread so hope I'm not posting stupid suggestions!!), share the night times as the day is hard enough on your own!! Take shifts, your DS does need to be fed but does not need to be held by you all the time when he is not feeding. If he sleeps at all at night, you do the feed and get DH to settle. If he does not settle, do the rocking, pacing, sitting in the armchair in shifts so that you each get a couple of uninterrupted hours of sleep.
Good Luck - you are not alone and yes it is hell but it will end and your baby will not remember!!