Constant work anxiety and burnout, where do I even start to get help in SG?

Been exactly where you are, the Sunday night chest tightness, so first, that is real and you are not weak, that is your body waving a red flag. Where to start in Singapore, from lowest barrier up. One, free and confidential: the national mental health helpline and Samaritans of Singapore (SOS) if you ever feel really low, and the Institute of Mental Health (IMH) has a helpline too, you don't need to be in crisis to call, they can point you to resources. Two, your polyclinic or GP can be a first stop, they assess and refer, and it is subsidised; some polyclinics have mental health support. Three, community options like the CHAT (for youth), Community Health Assessment Team, and family service centres offer support, and there are subsidised counselling options so it is not only expensive private therapy. Four, if work is the core, check if your company has an EAP (Employee Assistance Programme), many do and it is free, confidential counselling sessions you may not even know you have, ask HR discreetly or check the intranet. Does it help? For me, yes, hugely, therapy plus small boundary changes at work turned it around over months. Start with one phone call or one GP visit. You don't have to fix everything today, just take the first small step.