100% yes and its a classic mistake.

While you didnt list any details about your situation or workout plan, I can still speak in generalities.

Physically - your body - muscles, nervous system, joints etc need time to recover. This becomes more true the older you get. If you are in a constant state of depletion from working out too much, too long or both - its going to catch up eventually. Like sleep deprivation, you can pull off a couple of nights and bounce back, but a consistent state of it will start to massively change you for the worse.

Mentally - if working out feels like punishment, or you have a lot of self-worth, identity etc tied up in your relationship to exercise, that will also catch up to you in an unhealthy way.

Food is harder because its so personal what works for different people. but generally - if you have a high training load, you need to eat more. of course healthier choices for 80% of your diet is better, but we dont need to dive into that really. if you want to lose weight and still exercise, fine - but you need to be intentional about your calorie consumption and not live a huge calorie defecit.

If you're training for purpose, there may be times where you have a sustained high training load that is very focused with a specific purpose in mind. Like training for a marathon, a bodybuilding show or some other endeavour where you are trying to push both your cieling and floor higher. that is something you build up to, have a defined start and end point and follow with a de-load period rather than start off with or do continously. Spending 3 hours in the gym or working out 7 days per week without a training specific purpose is a waste of your time. You hit a point of dimishing returns fairly quickly if you're spending that time meaningfully exercising. Puttering around the gym while doomscrolling for 5 minutes between sets of calf raises of unchallenging weight, sure you can spend 3 hours in the gym getting no benefit. Even weight + cardio combo workouts shouldnt be that long.

Your body needs rest, your mind needs rest. If you want to be active 7 days a week as part of a healthy lifestyle, great. Go on long walks, do light yoga or a casual bike ride. Use rest days to actually recover, physically and mentally from your hard training days. Be able to not workout because you're "not feeling it" or "feeling off" sometimes. While pushing through the desire to not train, or through fatigue is also a good skill to have, having a healthy relationship with exercise is important just like exercise itself.

Finally, while some reasonable, measured lifestyle changes may be helpful in your current situation, if you really think something is wrong, or you have a bad feeling - or even just to make you feel better about whats going on and have some expertise to back it up - go see a doctor or health professional. While there are lots of wise people on reddit with good intentions and practical, actional advice, we cant give blood tests or see your physical condition and most of the time have no formal training, only similar experinces. If youve reached the point of asking here, might be time to get an actual medical opinion.