Another way of acquiring useful energy from dark energy is to place two objects extremely far away from each other and give them a velocity towards each other that is somewhat less than their recessional “velocity”. The two objects will initially be transported away from each other because dark energy is creating new spacetime between them even though relative to spacetime they are moving towards each other. Then, mutual gravitational acceleration gradually increases the velocity of these two objects. The velocity of the two objects towards each other eventually overwhelms the creation of new space by dark energy. Thus, the objects return with a kinetic energy greater than what would be generated by the conversion of gravitational potential energy to kinetic energy alone.
Edit: Typos.
I just wanted to comment in order to empathize with your terrible misfortune regarding mold. I am similarly vulnerable to mold poisoning and have found both the first and second order effects of mold to be devastating. I guess I want to say that I feel your pain and I’m glad that you got better.