Stress101,
titrating is a good idea. And you seem to have all of the information you need,
Sometimes our bodies adjust so that the fatigue lessens and/or goes away after a few weeks on a full dose.
The medication works by flooding your blood with calcium, The high calcium expands your blood vessels and drops your blood pressure which can cause fatigue. Calcium and blood pressure usually return to normal four hours after the injection. You could try the injection at night when fatigue can be advantageous, But it can created a falling hazard if person needs to get up in the night because of the extra hydration.
Tymlos can, but rarely, cause extended hypercalcemia. I think it is in cases of low kidney filtration rates.
I haven't taken Tymlos, but am quite happy on Forteo. Is this one of the medications you have already tried. It is a lower dose of medication than Tymlos.
Will you start at 2. I would and wait a few days inbetween before stepping up. If you have effects step back down for a few days. I think windyshores said she'd gotten to 7.
I think these set doses are a little high for most of us.
Have you spoken with your doctor.