It is very comforting to read so many stories that sound much like mine. I was diagnosed last November (8 months after getting married for the second time). My concerning symptoms were kidney-related, as I was convinced I had diabetes. I was overdue for routine blood work at the time, and decided I should get it done based on those symptoms. Like many of you, I was active and quite healthy (other than some mild high blood pressure), and I have almost no cancer history in my family. The bloodwork showed very high calcium levels, enough that my GP's office was concerned that I needed to go to the emergency room. After running the bloodwork again the next day, I found myself admitted to the hospital. The nephrologist who consulted with my GP knew it was multiple myeloma based on the blood work, but they also found some lesions and two small compression fractures in my back.
I should note that two weeks before that day, my wife and I had been in Israel and we climbed up Masada (the hard way!) together. Discovering that I did that with those fractures officially makes me a bad-a**

Thankfully, the excellent hospital care I received avoided any kidney damage, and my back issues seem to have mostly healed. I do have Stage III because I have one of the chromosomal abnormalities. I was on Velcade, Cytoxan, and dexamethasone for about four months. My kappa count was 2006 when I started that treatment in early December. By March 1, it was down to 11 and has stayed in that range since. I also tolerated the treatment regimen extremely well.
I am an economics professor and have been able to teach online this past semester, but I've still been able to make the hour-ish commute to my office once or twice a week. I've also, since late February, been able to travel for professional work, including a multiple day trip to Las Vegas at the start of April. I have very little back pain, and my stamina is pretty good. I feel very fortunate that I've been able to keep up with my work through the first stages of treatment.
I am now on my second day of growth factor shots for my stem cell transplant, which I will do inpatient starting on the Tuesday after Memorial Day here in the U.S. I thank all of you who have posted stem cell transplant journals here in the forum. Reading those has been very helpful in preparing myself for what's to come. It seems the consensus is "it's not as bad as you might fear, but it's still not fun." I hope that my near-absence of side effects from the induction therapy bodes well for the stem cell transplant process!
I look forward to learning more from the people and resources here. I hope to stick around for a good, long time.