The former Sydney rugby star and mother of three was diagnosed with melanoma in 2015.
She battled it for two years before being diagnosed with pancreatic cancer in March this year.
Wood told the ABC she had not had any contact with doctors since the cancer diagnosis.
“I don’t know how much longer I can go on, I’ve been fighting for a year, I don’t want to go to bed until I know I’m 100 per cent,” she said.
“There’s so much work that needs to be done, and so much pain.”
The former Olympian, who also ran a charity and mentoring program, is hoping to raise $50,000 to help with her treatment.
Ms Wood says she has been a “soul-saver” for her family since she was diagnosed.
She says she is proud of her work with the community.
“The support I’ve received has been incredible.
They’ve made sure I’ve got the treatment that I need and that I’m getting the support that I really need, and I really appreciate that,” she told the Nine Network.
“To get that support from people who can’t be there to help me, it means a lot to me.”
Ms Wood has been an inspirational figure in the community and is working to get more people involved.
“Melissa is one of those people who is doing what she can for the community to support her,” she added.
“We all have to step up and make a difference and we have to all give our time and our energy.”
She says her recovery is progressing well.
“At the moment, I’m able to do all the things I want to do, which is to work, to do some exercise, to walk and run and to get into some of the sports I love,” she explained.
“It’s going well, I feel very much at ease.”