FMLA and Long-Term Disability

Pulmonary Sarcoid. The only symptom is the skin-crawling body aches, but it's 24/7 when it flares up. Just had my eye assessment (clear) and waiting for breathing test results. I wake every morning with the body aches and they definitely flare up for a couple days after physical exertion (cleaning house, shoveling snow).

I'm considering talking to my dr about FMLA from work. I have a corp (WFH) job, but I'm quickly finding it difficult to work for any extended period of time. The pain is distracting and makes me restless, and the whole thing makes mental focus difficult. I feel like I need full discretion in my schedule to manage the pain. I'm not on meds and don't want to be. Ibuprofen does nothing. Getting relief from: dry saunas at the Y, hot epsom baths, yoga and vibration plate.

But, dealing with the pain as I need to throughout the day isn't conducive to my job requirements. I'm also unsure if things will worsen. I pay for LTD coverage at work and the company pays STD. I don't want to short-change myself if disability is the right way to go, but I've never been in this situation. I can manage with the reduced income. It's a stressful job which I know contributed to my immune system being compromised. Any guidance with this process?