Well, yes and no, Violet.
You see, the school do not have to give children medication at all. I know of many schools who insist that parents come into the school to give medication. And I know for a fact that my children's school will only normally give regular medication if it is needed more than 3 times a day, as otherwise it is considered that with a little effort the parent can manage to give 3 doses outside school. The only exceptions to this are things like asthma medication, diabetic stuff and Ritalin type meds. Now, my point was - it could be that your complaint here is reasonable - but it also could not be. We can't really judge as we have no idea what the medication is or what it is for. Or indeed how often it does need to be taken. Without that information all one can do it assume that there is a reason the school are not "volunteering" to give it.
The school trips thing also sounds fairly standard. If I couldn't pay for a school trip I would expect my children to not attend. The school will do there best to get parents to pay for trips, before offering free places to children - because otherwise parents would just not bother to pay. And if enough parents don't pay then the trip can't happen. And it is also unreasonable to be cross at her for sending you reminders that the money was due - she is the head of a school, not your personal financial advisor, and she can't be expected to remember WHEN you are going to be paid and thus able to contribute. It doesn't sound to me like she has been particularly unfair to you there. YEs, she could have said "That is OK, you don't need to pay and your son can still go" - and that is of course the legal position - but she was never going to say that because then the school would have to find the money for your son's contribution from elsewhere, and school trips are really expensive to run.
I did cover the hair thing in my response before - where I said that in this you were clearly not being unreasonable and should double check that the rule is not being applied fairly before writing to the governors.
The comment about the form has clearly got lost in the morass of your other complaints - nbo, that doesn't sound unreasonable either.
However, your general attitude does seem unreasonable. So many times you have said "my son shouldn't be expected to change", "my son is being discriminated against because of his SN", etc. And frankly, as I said, you have given no indication what his needs might be. And I am afraid as a mother of children with SN myself, I do think it is important that a child is encouraged to fit into society where they can. I know schools are supposed to alter themselves to fit the child, etc, but children also have to learn how to cope with a range of people with different expectations. And you have said nothing about what his needs actually are other than to indicate that you expect everyone to fit around him. Now that might be reasonable - depending what your child's specific needs are - but I strongly suspect it is not reasonable.