I know this is a week late but please never feel like taking time off work for chronic illness makes you lazy or a bad employee. Sounds like you had a taxing week, it makes sense that your symptoms would flare. Do you have accommodations through your employer? If not please get on that, then they legally have to grant you things like leaving early, etc. It's not your fault that you're sick and you don't need to push yourself into a worse flare just because you feel socially obligated to. If a coworker began coming down with the flu at work they would be allowed to leave, same with you except your illness never goes away. Your health comes first, always, don't let internalized ableism get to you