If I read your message correctly, your tumour now measures 11.5x4.9x4.3 cm. This is a large size for an intraspinal tumour. I am afraid such a tumour is likely to cause persistent and worsening symptoms. I understand your reluctance to undergo surgery in view of your earlier experience but there seems to be no alternative. I suggest you consult a senior neurosurgeon in a large teaching hospital near your residence and request an opinion and advice. Should there be no such institute, please go to a metropolitan centre such as New Delhi, Mumbai or Bangalore.
If, as I expect, surgery is recommended, please request the surgeon to proceed once you understand the benefits and risks.