Since many ANA's are false-positive, it is a good idea to really focus on the symptoms instead. Hashimoto's, Raynaud's, and numb hands and feet might be the sickest you ever get, or they might be the harbinger of another autoimmune illness. It's customary in this situation to get baseline testing and then to be monitored for awhile. I've heard of many people in similar situations monitored for even ten to twenty years and then, finally and mercifully, getting the "all clear".
As I understand it, with a few symptoms of connective tissue disease and a positive ANA, your odds are about 50% that no other diagnosable autoimmune disease will ever develop. But, that 50% is a lot higher risk than that of a normal, healthy person. Further complicating your situation is that Hashimoto's (and Sjogren's) seem to be the key conditions that tend to set the stage for future autoimmune developments. Its not a certainty, more like just an increased inclination. (See Polyautoimmunity)
This leaves you in a delicate position. You might not ever be any sicker, so try to keep your head on straight that your future is definitely not all doom-and-gloom, but by the same token it would be an excellent idea to dutifully continue with your follow-ups until you are given the all-clear. The only thing I would change is that if I were you, and if I were not already doing so, is that I would see if I could be screened and followed by a listed scleroderma expert, because odds are very high that your local rheumatologist is not adept or deeply experienced when it comes to scleroderma.
Scleroderma is a very difficult disease to diagnose, and doctors who are not extremely experienced in it can easily miss important clues. Furthermore, they can treat the illness either too aggressively or with way too little, way too late.
Therefore, I would sleep a little better at night, knowing you have seen an expert. I know its maybe a huge fuss about nothing, there's at least a 50% chance of that, and certainly, from what you've mentioned so far, it doesn't sound like you are in danger of getting diagnosed with anything (more than you already have), just yet and maybe not ever! But still, it's good to be on the safe side of things, don't you think? Read more at Scleroderma Diagnosis.
Or, just sit tight with your local doctors but if additional symptoms develop, then hie thee to an expert. But do put a listed expert on your radar, as it can take months to get in to see them for the first time and for most people it entails a trip out of state since real scleroderma experts are so very few and far between.