Welcome to Sclero Forums! I'm sorry you have some health issues now and hope that you feel a bit better soon.
It's good that you are going to see a rheumatologist. But in the meantime, I hope that you work closely with your primary care doctor to address any issues that they can handle. For example, ask them to screen you for depression and treat you for it, if necessary. It might just be that you are feeling stressed, from worry about scleroderma, and not that you are seriously depressed in need of treatment. But that is not your decision to make, nor mine, either. However since you say you are feeling depressed, you might feel a lot better if that possibility was properly tended to.
It also might be that you have some sort of sleep disorder. And that could easily make you feel bad all the way around. Neither depression nor sleep problems are issues that your rheumatologist would be inclined to address, so you may as well pursue these with your primary care. Also, neither depression or sleep problems "count" towards a scleroderma diagnosis so you just want them addressed, and treated if need be, as both issues would greatly impair your ability to deal successfully with ANY sort of ailment or chronic illness.
You can also discuss with your primary care the possible causes of your blood work. Are there more tests they can run, to narrow down possible causes? Maybe even a repeat test might show that they have magically resolved themselves, which happens to be extremely common and may be a huge mental relief for you, should you be fortunate enough for that to occur.
In other words, don't put your health on hold until October! March forward with plans to tackle what you can tackle now. Since you mention poor sleep, muscle aches, stiffness, and depression, you may also ask your primary care doctor to screen you for fibromyalgia. Fibromyalgia is very common by itself and also can occur along with many other illnesses, including autoimmune diseases.
And again, these things are not listed symptoms for the diagnosis of scleroderma, so you won't get any bonus brownie points from the rheumatologist for suffering with them in the meantime. You might possibly even score a diagnosis of fibromyalgia before you see the rheumatologist, and then be able to also discuss fibromyalgia treatment options with them. And if by chance fibromyalgia is ruled out by your primary care, that is also something for consideration.
While you are waiting, I do see hope for finding some ways to improve your health a little bit, at least enough to make it a little easier to get through each day. Also cut yourself a break because worry can drag us down very quickly and easily, interfering with our sleep, our self-care, and our energy. Being worried about possible scleroderma is no small thing! It can quickly develop into a major anxiety for those who are prone to worry in the first place. If that's the case for you, please talk to your doctors about that, too.
In other words, work on focusing your primary care doctor's efforts on ways that you could begin feeling a little better TODAY. You don't have to wait for months just to have a little ray of possible hope! Most people, even with severe forms of scleroderma, still manage to be happy and productive in their lives. We can find joy and happiness almost everywhere we look, from the array of books we've read in waiting rooms to the coffee shops or restaurants we've visited before or after. We indulge in hobbies for a healthy outlet for anxieties. We try to simplify our homes and lives to make them more enjoyable and easier to manage. You have a lot to learn how to look forward to, hanging around this crew!
At minimum, in my personal opinion, you deserve a better night's sleep and a few health improvements to look forward to. Please let us know how you manage to pick up the pieces to find a few health improvements, while we all wait for more information, along with you.