We're looking for guidance on how to claim money and help for our son's situation

Hi I am trying to help my son. he as for 15 years been in a high pressure job and because of the continuing pressure decided thankfully to finish as his health was suffering. He was on the sick for 8 weeks and found another less pressure job. He resigned from one and started the new one. 2 days later he had a mini/mild stroke. He has been told to not work now he cannot drive and his lifestyle hopefully temporary will have to change. He is single as his relationship has broken down and his house is being sold. He now has no income no job and mentally he is struggling. We as parents can help so much but he has gone from hero to zero and finds himself at a very low point, We are looking for guidance in the way forward on how to claim money and help for his situation. We as a family have fortunately never been in the position  like this so we have no idea where to start. Thank you for reading this and hopefully you are in a position to advise us