If you are concerned for yourself, or for someone else, and require immediate support your GP is a good place to start.
There are also a number of organisations/charities which offer counselling and support via telephone or online platforms. A selection of them are (please note that times may vary due to Covid-19 working):
The Samaritans (24 hours, 7 days/week)
Telephone: 116 123
https://www.samaritans.org/?nation=wales
The Community Advice & Listening Line [C.A.L.L.] (24 hours, 7 days/week)
Telephone: 0800 132 737
Text 'help' to 81066
http://www.callhelpline.org.uk/
LGBT Cymru (every Monday 7pm-9pm)
Telephone: 0800 980 4021
Mindline trans+ (Monday - Friday 8pm - midnight)
Telephone: 030003305468
Shelter Cymru
Childline (24 hours, 7 days/week)
Telephone: 0800 1111
PAPYRUS - Children and Young People under the age of 35 (9am - midnight)
Telephone: 0800 068 4141
Text: 07860 039967
https://www.papyrus-uk.org/