Many many different conditions affecting respiratory function op.
If you can cough secretions into your mouth you spit them out. If you can't them I'm not sure where you are sticking the suction catheter because people can't tolerate them being inserted into airways orally when concious?
Sorry, I'm not interrogating you I just don't think you are as reliant on this medical equipment as you think, maybe it's from when you were first unwell and it's stayed. Ask your respiratory nurses to review your requirements.