Occupational Therapy: A whole different world for us

I, of course, have heard about occupational therapy for many, many years in my field of work, but until yesterday and since I started reading "The Out-of-Sync Child", I just never knew how much OT's actually work on and how much these things can affect a child.
I listened with awe yesterday to the questions and comments from the Occupational therapist that evaluated Brycen and will be working with him. While most people think of fine motor skills and learning to adapt to the world around them when someone mentions OT, I learned there is so much more to this.
If you have watched Brycen eat, he drools almost at every meal and snack. Did you know that could mean his oral motor muscles are not developed enough and need work to become stronger?
Brycen has always had an issue with choking on food and gagging. She said the reason he may only chew his food a little bit is because his muscles in chin and mouth get tired of chewing so he just swallows, hence the choking. Most people can leave their almost 4 yr old child while eating and go to another room, but we can't do this for fear of this exact reason.
While Brycen seems to be on track with fine motor skills, they will be testing his grasp and the way he uses utensils, etc to see if that needs any help.
They are also looking at the reasons Brycen chooses to eat the foods he does and refuses others, whether it is color, texture, temperature, etc. So now I am keeping a food log for the next few days with what he is given, how much he eats, etc. This will also be helpful for nutritional purposes as Brycen is very low on the percentage of his weight compared to his height and head size.
I am very grateful for their help in these next areas of loud noises, teeth grinding, and oversensitive to various touch such as during a haircut or during brushing teeth. She said they are going to work on desensitizing the areas first with different techniques. With the teeth grinding, we are going to try to replace this with another sensory seeking item. We have noticed he doesn't grind when he is doing a lot of jumping, running, or at the park climbing, but he will frequently grind during meal times or when he seems "bored" and "stimming." So obviously, he is not seeking some kind of oral sensory, but needs something else to "distract" him. I hope that makes sense!
So, I knew Brycen had some sensory issues, but I guess I never realized how much there is to work on in addition to his speech and communication, appropriate play and socialization, sleep issues, aggression, and many more. The list of things we work on every day just keeps growing and I am learning so much about why he does the things he does and what we can do to help him in these areas.
We are now tacking on two OT appts per week in addition to our 3 speech...luckily they will be back-to-back appts so we don't have to drive there more than 3 times per week...but it's just exhausting thinking about it!