Welcome, S.! This is a great website as where else can you hear so many stories of moms who are going through or have gone through the same situations as you.
I just wanted to share with you my thoughts. About three-7 months some babies go through a tough time and seem to have colic. What helped with my kids was different with each of them. My oldest I BF for the first three months until work and lack of sleep made me need to stop and switch to formula. It was hard on his tummy to make that switch and the iron constipated him at first. The mylicon drops helped emmensly to Calm him down after his feedings, but it is important they have the iron so I stayed with the iron formula. With my second, I nursed him until I found out we were pregnant with our third. He was 7 months old. He was fussy late in the day every day! I would have to keep bouncing, moving, or swinging him with the car seat. The regular swing just did not do it for him. So until he was too heavy to swing anymore, my husband and I would take turns swinging him in the car seat. Felt like my arms would fall off:) He also would need to burp more then just getting the first one out. I would rotate positions burping him. First over shoulder rubbing in large circles from top to bottom. Then, sitting him upright on my lap and laying him down and back up over and over. And sometimeslaying him on his back and pulling his legs up towards his tummy and down again. I also would give him the lavendar baths and then massage the lotion on his back afterwards. With our third, when she got fussy she just wanted to be left alone. It took me a while to figure it out. I would try holding, singing, dancing, bouncing, but she would not settle down until I just laid her down in her crib. She did not like to snuggle. Probably just over stimulated during the day and needed to just be at night I guess. I kept thinking something was wrong and I needed to do something, but not in her case:) You're so new to all of this and it will take sometime to figure out just what your baby wants. Just keep trying different things until you find what works for him. Also, try to stay as calm as possible when he is fussing. Babies can sense when you are stressed and often times will be stressed more just because you are. When you find that you are starting to get to that point remember to take a break, ask your husband for help, or just lay him down until you can take a deep breath and start again. When nothing would work, that's exactly what I did. Just put the baby somewhere safe like his crib. Walk outside your door so you can not hear the crys and have a cup of coffee or something to just relax. Then when you can go back in and see if he is more receptive to you again. Hang in there! It wont be long until he's two and all you hear is "NO!" Or wait until he's ten and everything "is so unfair" Mine are 10, 4, and 3. If you ever need any advice feel free to ask.