For the cursor to large, that's caused by an OS setting. Go to System Preferences... then click on Display in the left column. Click on Cursor and make sure Cursor size is set to "Normal"
Second, for the trembles issue, restore your preferences using this manual method: https://helpx.adobe.com/photoshop/using/preferences.html#Manually Does it work correctly? If that doesn't solve it, you can quit Photoshop and put the Settings folder back. If it does solve the problem, I would like to get the folder of settings to try and figure out what is bad with them.
Senior Product Manager - Customer Advocacy - Digital Imaging