10,000 iu of Vitamin D3 per day. Is this dosage harmful ?

I have been on 50,000 IU weeky for 2 years now, with no side effects. I started out taking it every other week, then he increased it to every week and kept me on it. I just use the regular Vitamin D because I was told they do not make the D3 in that strength. I am monitored every 6 months, or yearly, by my endocrinologist and my OBGyn. That would work out to a little over 7,000 IU per day. But I am 79 and my absorption rate is probably much slower than younger folks. My levels finally went above 30 last year, but they have kept me on it. I expect it could be harmful if it is not monitored since it does accumulate, just like Vitamins A and E.
It is truly harmful for it to be that low though, so you need to decide WHY it dropped and correct that before you lower your dose too much. I stop my work and get out in the sun, no sunscreen, at least 15 -to 20 minutes every day that the sun is shining. No hats or long sleeves when it is warm. Shorts. This is also the directions I got from a dermatologist who had prescribed the sunscreens, hats etc. for too much sun. She said they went overboard on that and that we need new guidelines. Still have to put on the protection for prolonged exposure though.
Like many helpful things, it takes some time to be helpful. Be patient.juneaf