1. lasting forever; eternal. 2. lasting or continuing for an indefinitely long time: the everlasting hills. 3. incessant; constantly recurring: the everlasting changes of season. 4. wearisome; tedious: his everlasting puns. 5. the, eternal duration; eternity. 6. the Everlasting, God. 7. any of various plants that retain their shape or color when dried, as certain composite plants of the genera Helichrysum, Gnaphalium, and Helipterum.
A bathtub chair is placed in a bath or shower to give an elderly person a place to sit down when showering. They are referred to with many different names but there are essentially two types of bathtub chairs: Bathtub/shower stool (with no back) Bathtub/shower chair with a back.
Your grandma could have the answer. Epsom salt has been used for hundreds of years to ease all kinds of aches and pains. A simple soak in the tub may help you feel better.