Well, I usually see it like the others, a center of light, warm and really good to "touch" and have any interactions with! But in the sensations I've described ( I'm really more sensitive to sensations than visualization) it's been like a heavy hot ball that seems to be trying to expand uncomfortably and that brings a certain discomfort and burning felling even in the most basic meditations, like aura protection and aura cleansing.
It is the most powerful and important chakra in the entire soul.
In my meditation experience, I feel it emits waves of power, and I sense a strong self-love emanating from the fire element.
Perhaps you need to adapt to the increased power and increased self-esteem. The Solar Chakra, undergoing purification and transformation, may exhibit the symptoms you mentioned.
I have done many works for this chakra, and one of the most useful is using the Urüz rune to free it from blockages and simultaneously increase its strength to improve energetic adaptation.
It is helpful to address the perception of one's personal power and self-love, which is a mental aspect.
In the beginning, it is better to purify the chakra more before strengthening it; then, it becomes easier to open and strengthen it more quickly