Hi Mary, welcome to the forum. I too was diagnosed recently. Like a lot of us, I have the all over fasciculations, several per second in each limb, but mine are generally very gentle and not bothersome. It has only been about 4 months since I first noticed symptoms, but I have not had much progression. So hopefully it will remain slow.
I also was unclear about the UMN situation. I asked my doctor about that specifically at the ALS clinic on Thursday. He looked me over again and said that I had mild UMN signs. My reflexes are a little strong, or as they say "brisk". Scraping the bottom of my foot was kind of ambiguous. I forget how it is, but normally the toes go one way, with UMN damage they go the other way; mine kind of wanted to go both ways. So he felt like he was seeing some possible issues. But I gathered that the diagnosis was largely based on EMG, and in particular about an apparent worsening of EMG readings over a few months.
Oddly my limb strength still seems good, even though the EMG shows nerve damage. Sometimes I think the nerves can die but be taken over by other nerves, up to a point; so you don't lose strength until the process is well established. It's scary to think of this happening but I am just trying to appreciate and treasure every time I go out and am able to move around freely.
With the saliva, they told me that you don't actually produce any more saliva than usual, rather you are not swallowing it normally. At the ALS clinic the speech therapist gave us a lot of good advice about eating and swallowing, so if you have problems in those areas, an ALS aware speech therapist may be able to help you.