I've raised £500 to Aaron's fight against childhood cancer

My son Aaron at 12 years of age was diagnosed with a rare form of a malignant germ cell tumor on the 26th April 2019 and is currently undergoing an aggressive adult chemotherapy treatment. Due to this type of treatment he has missed many weeks of schooling and although he has now returned to school on a part time basis when he feels well enough, he has missed a lot of work and I feel that, as he will be starting his GCSE's in September, some extra tuition (when well enough) would benefit him in being able to keep up with the work he is missing.
I am not comfortable in asking for monetary help but, with both myself and my husband being self employed and not being able to work much throughout his treatment, I feel that I have to ask for help to cover these costs.
Any help will be gratefully received and I thank you in advance.