@Birdsofprey is absolutely by stating the HDL and LDL differenciation. The general statement, cholesterol is to high by the physician, doesn't recommend this person to be well educated.
But your protein dominated nutrition, is typical for our time: quick gains. First of all: Be aware of your kidneys. Protein enhances acids. Though you eat veggie there is basic for balancing. Fruits are either acid but carbohydrates. And in general not complex carbohydrate chains.
Are you in your menopause? Everything changes, too, and it's not a female issue only. Hormon ratio. Fats...
Eat a normal nutrition, balacend carbs - and aswell with complex chains.
And don't train hard and doggedly but smart. Medical studies depict, the older we get, the more efficient and effective is lifting weight to control our body weight.
It's not endurance cardio training. For our heart daily pedestrian activities, prefering to walk instead of using engine supported means of transport, using stairs instead of the escalator or lift is more relevant.
And it's not needed to lift weights like Arnold Schwarzenegger - and even long lasting. A few reps and sets over the day with low weight is enough. Like Kettleballs. Do a quick 5 min row on a rower machine, because it supports either the isometric movent of hips, pivots of knees, ankle joints, and you execute arm and shoulder training and even the stomach and lower back is addressed. Even for strength training resistance straps are recommended (
e. g.).
No pain, no gain as a principle has been overcome.
In total better do a daily 15 min routine, than once or twice a week a fully mentally and physical exhausting hours lasting, which requires long recovery time and frustrates, because after every training, your mind and muscles can't fulfill their average duties because of being still overwhelmed.
The poor soldier who once founded the marathon race by accident, could only spoke out the tasked message and died immediately.
In the early years of my military career we had minimum twice a year marches of approx. 19 miles with backpack (of 22 lbs). Some ran the whole march. At the destination they puked.
The smart soldiers walked close to the limit of 5 hrs and were able for further military tasks.
A few years ago they changed to 7,5 miles in maximum 2 hrs and a weight of 33 lbs. The suit remained the same: BDU without wearung a helmet. On a dismounted combat patrol the march is one task to a destination. At that you might man control points, do reconnaissance, build fighting positions, set up a hide, or fight a raid because the patrol was the infil.
Additionally pilates or yoga postures support to stay flexible and smooth or improve mobility on the long run.
Stay relaxed and patient.
Seek - pointing on Aristoteles - the average.