A web search produced the following links, mainly selling badges and key rings:
ME/CSF awareness button
https://www.zazzle.co.uk/me_cfs_awareness_butterfly_button-145821841941928005
Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Awareness Butterfly Mask
https://www.redbubble.com/i/mask/My...ness-Butterfly-by-caitlinjcook/54196511.9G0D8
Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Awareness Butterfly Pin
https://www.redbubble.com/i/pin/Mya...ness-Butterfly-by-caitlinjcook/54196511.NP9QY
Wollongong ME/CFS/FM Awareness Group “The blue ribbon and butterfly are the symbols for ME/CFS, the purple ribbon and butterfly are the symbols for FM and the green ribbon and butterfly are the symbols for MCS.” see
https://www.mecfsfmwollongong.org/
Donnee Spencer’s Medical Awareness Butterflies - “Over the last few years Donnee Spencer has produced these amazing awareness butterflies. As you can see so far she has covered psoriasis, multiple sclerosis, COPD, strokes, Crohns, cancer, autism, fibromyalgia, diabetes and cerebral palsy among others.” See
https://patienttalk.org/donnee-spencers-medical-awareness-butterflies-which/ and for ME see
https://patienttalk.org/myalgic-enc...donnee-spencer-brilliant-awareness-butterfly/
ME CFS Blue Awareness Large Butterfly Hope Spoon Bag Charm Keyring add Personalised Initial see
https://www.desertcart.in/products/...on-bag-charm-keyring-add-personalised-initial
Chronic Butterfly - Fibromyalgia Awareness Facebook page see
https://www.facebook.com/chronicbutterfly/
ME/CFS South Australia - “I owe my life to Butterfly: DAWN Poleon feels Blackpool-based charity
The Butterfly Group saved her life. The mum-of-two, from Layton, has suffered from fybromylgia and chronic fatigue syndrome for around 15 years.” See
https://sacfs.asn.au/news/2011/10
The Butterfly Group: “The Butterfly Group is a charity which cares for all those affected by immune, auto immune and chronic disorders. The charity’s head office is based in Blackpool and will be helping over 150 illnesses and over 100 symptoms and related disorders across the country. After extensive research The Butterfly Group is the only charity in the UK that supports and cares for these illnesses as a collective group of disorders under the umbrella of immune and auto immune disorders. The illnesses include Rheumatoid Arthritis, Sjögren’s Syndrome, Chronic Nephritis, Systemic Lupus Erythematosus (SLE), forms of Anaemia, Multiple Sclerosis (MS), Psoriasis, Crohns Disease, Primary Biliary Cirrhosis (PBC), Sjögren’s Disease, Fibromyalgia, ME, CFS, Coeliac Disease, HIV, DiGeorge Syndrome, Wiskott-Aldrich Syndrome, Anaphylaxis, Lymphopenia to name but a few.” see
https://www.discoveradventure.com/charities/butterfly-group
It seems that the Butterfly symbol is not specific to ME/CFS but started life in relation to a number of chronic conditions, with different conditions being opted in with a different coloured butterfly. Presumably it started in Australia but I am not certain of that. Judging by some of the items on sale there is a link to members of the Spoonie community too.
If we are looking for a totem animal, can I tongue in cheek suggest the sea cucumber.
[corrected a couple of typos]