Photos and Notes in Mac not syncing with iCloud

Hi.

I have a MacBook Pro (Retina, 13-inch, Mid 2014) and an iPhone 6 (OS version 11.4.1).

I updated my OS one or two weeks ago and am now using High Sierra v10.13.6. Before the update, Photos and Notes were working perfectly. However, after the update, Photos and Notes are no longer syncing on my Mac with iCloud. All new photos and notes that I take with my iPhone appear on icloud.com, but not on Photos and Notes apps on my Mac. Moreover, the Calendar works good on both the iPhone and my Mac, events are syncing well.

A few important things:

1. It is not because I run out of space because I have 2.8 GB of 5 GB available on my iCloud.
2. I checked that the "iCloud Photo Library" option of Photos is checked. I also tried with "My Photo Stream" on and off.
3. I tried logging out of my iCloud account on my Mac, waiting a few minuted and then logging in again, but this did not work.
4. I did not keep a copy of the iCloud files on my Mac when I logged out of my account. I created a brand new library on Photos where I do not have any pictures. When I open the app I only get a message saying................ "Updating..."
5. I also erased all notes on the Notes app on my Mac. When I open the Notes app I get a constant spinning........ wheel on Notes.
6. My Activity Monitor is recording no network activity from "Photos Agent" nor "Photos"... 0 bytes Sent and Received.
7. I also tried leaving the Mac on overnight for two nights, and this did not solve the problem. My pictures are not that many as to require a lot of time to download.
8. Everything started when I ran out of space on iCloud. I had to log into the website and started erasing pictures and videos.

Thanks!