Find Psychological therapy (IAPT) services in your area.
Mind has a lot of good information on emotional wellbeing.
Good Thinking provides access to online tools and resources to help you, when you feel anxious, sleep deprived, stressed, and sad or low.
A book and online programme to help build genuine happiness from the inside out. It is based on an empirically-supported model known as Acceptance and Commitment Therapy (ACT).
This charity runs a 24/7 helpline if anything is troubling you. They listen to your concerns off the record. Just having someone to talk to that isn’t family or friends can be helpful. You don’t have to be suicidal.