Have you tried neurotherapy?
I worked as a neurotherapist years ago and, with the clients we had, if they weren't smiling in 1-2 minutes, either there wasn't enough goop on the electrode or I missed the spot.
Bcia.org likely has some good information & research.
Also, some chiros & therapists offer Alpha Stim treatments &/or rentals. If you are a veteran, the VA will give you one of these units to help with anxiety, depression, insomnia, PTSD or physical pain. (The more expensive unit has a TENS Unit as well as the ear clips for brain work.
Also, Yale is offering their very popular Science of Wellbeing course free here:
https://www.coursera.org/learn/the-science-of-well-being?utm_source=gg&utm_medium=sem&utm_content=01-BrandedSearch-US&campaignid=380484307&adgroupid=102187343498&device=m&keyword=&matchtype=b&network=g&devicemodel=&adpostion=&creativeid=433079694377&hide_mobile_promo&gclid=CjwKCAjw34n5BRA9EiwA2u9k3znhSHNLucvxQzKz4LEFN1L4qgVhlPDTb3zLsWBB0u-V9hrtMJDhuhoCZSgQAvD_BwE
I hope this is helpful. 
Edit history
= new reply since forum marked as read
