I urgenlty need to know which alternatives are possible. I know the first is correct. Thank you.

1) The doctor put a cast on my ankle/
The doctor casted my anke.
I had to keep/have/ a cast for a month.
2) Why don't you take some bicarb to help your digestion/for you digestion/which helps your digestion/that helps you digest?
He cut his finger while he was slicing some bread.
3) The surgeon put five stiches in his finger/the surgeon gave him five stiches.
4)The doctor put a cast on my ankle/The doctor put my ankle in a cast.
I had to keep the cast for one month.
I had the cast for a month.
5) I think you should disinfect the wound/vaporize a disinfectant on the wound/spray some disinfectant/put a disinfectant.....
6) The doctor prescribed a nasal spray to be taken/used three times a day.
7) I bruised my knee when I fell off my motorbike/falling off the motorbike.

1) The doctor put a cast on my ankle. <~~yes

The doctor casted my ankle. <~~no, "cast" is not a verb in this sense.
I had to keep/have/ a cast for a month. <~~yes

2) Why don't you take some bicarb to help your digestion/for you digestion/which helps your digestion/ <~~yes

that helps you digest? <~~only if you give "digest" a direct object.

He cut his finger while he was slicing some bread. <~~yes

3) The surgeon put five stiches in his finger/the surgeon gave him five stiches. <~~yes

4)The doctor put a cast on my ankle/The doctor put my ankle in a cast. <~~yes

I had to keep the cast for one month. <~~OK only if you put "on" after "cast"
I had the cast for a month. <~~yes

5) I think you should disinfect the wound/spray some disinfectant ... /put disinfectant on ...<~~corrections

6) The doctor prescribed a nasal spray to be used three times a day. <~~yes, with correction

7) I bruised my knee when I fell off my motorbike/falling off the motorbike. <~~yes