DD had bad colic and reflux from 3-14 weeks. Infacol, colief, gaviscon didn't work at all. The best things I would suggest are Dr Browns bottles, aptamil/cow and gate comfort milk (need size three teats though because the milk is thicker) this milk is also for constipation, so it may help with that too. Maybe get him checked for reflux? DD had silent reflux and the only thing that helped was ranitidine (liquid zantac) on prescription. Also, tilting the cot/Moses basket, prop one end up with books or whatever. I have always found the tommee tippee bottles horrible, DD used to choke and splutter with them, so I'd seriously consider changing to another brand. MAM are also good.
You could also try a different dummy, DD seemed to keep hold of cherry shaped ones better when she was going through her losing the dummy phase.
Another thing I would really recommend is an amby hammock natures nest. Quite expensive, can be picked up for less than £80 on eBay though. Ours really helped DD through serious colic bouts. You could try putting him in this at night instead of a cot, he may go back to sleep if you knock the hammock, the motion is supposed to soothe them. Retain good value too if you buy them second hand so not a massive expenditure.
Sorry, that was a bit of an essay. Without being pushy, I would urge you to change bottles. That made the most difference. I doesn't cure colic, nothing much does, but it helped with feeds.
Oh, and I know a few have recommended cranial osteopathy, we tried it, it made no difference whatsoever, so just be prepared that it may not work for your DS. To be honest, the only thing that really helps is time. This won't last forever, in another month or two he will be much better. Seems like a long time now, but once he starts giggling and playing, it will all seem so long ago.
Just one more thing (!), I found being out when the colic was due to start was quite effective in avoiding the worst. Maybe taking him for a walk/drive when the unsettled time is due to start may help. I know it's late to traipse out, but some fresh air in the late evening might help you both. Or get dp/dh on the case with evening strolls if you have one.
Cliche I know, but this too shall pass...