Betty Radford, 87, from Pilot Road, says the cherry tree outside her home has caused large cracks in the wall and accuses the county council of ignoring her.
Mrs Radford, who cares for her 93-year-old husband at the house, is now too afraid to go into her beloved garden because she fears the wall could topple over.
Despite voicing her concerns more than five years ago, she says their health is faltering because of the stress and feels angry the council refuses to take action.
She said: "I am furious with the county council. It is their tree that is causing all the damage, but I think because we are elderly they just don't bother.
"I have been pleading with them to do something about this for years, but they just don't listen and I have started to get giddy turns because I am not sleeping well.
"I love gardening and people used to comment on how nice the flowers and plants looked in my garden, but it is a mess now because I am too afraid to go near it.
"My husband has had six strokes and all of my time is taken up looking after him, so I am afraid of what will happen if this is not sorted out soon."
The Radford's, who have lived in the house since 1958, says the roots are also coming up through the pavement and the pair have been too worried to go out for months.
They have received support from Hastings MP Michael Foster, but fear someone could be seriously hurt if the wall is not repaired.
A spokesman for East Sussex County Council, said: "East Sussex Highways staff have been monitoring the wall and do not believe it is affected by the cherry tree roots, but by the weight of the earth on one side.
"This does not pose any danger at the moment, but we will continue to monitor the situation."